In this task, you are given a conversation between a flight agent and the customer. You are given 4 options and you need to select the goal of the conversation. It is provided as part of customer's context, which has to be one of the following: `book`: Make a new reservation, `cancel`: Cancel an existing reservation, `no_flight`: No flight found for the customer's preference, `no_reservation`: No reservation / No change / No cancellation was made in the conversation, mostly enquiring details

[EX Q]: customer: Hi. I am Jessica Evens. 
 agent: Hello,. How may I serve you? 
 customer: I want to book a flight ticket on  01/04 to 01/06 for which I have a exam at IAH. 
 agent: Sure, may I know your origin point? 
 customer: My source code is ATL. And I want with 1 connection. 
 agent: Sorry to inform that there is no flight found with your specification. 
 customer: Ok. Thank you for  information and your service. 
 agent: Thank you for reaching us.
[EX A]: no_flight

[EX Q]: customer: Hello. 
 agent: Hello. 
 customer: I am Elizabeth Walker. 
 agent: How may I assist you today? 
 customer: Will you please assist me in booking a flight ticket from ATL to CLT? 
 agent: Sure, may I know your travelling dates, please? 
 customer: I am planning to depart on June 07 and return on June 09. 
 agent: Do you need any specification? 
 customer: I need a halt in between my journey. 
 agent: Sorry, there are no flight tickets available on your journey dates. 
 customer: Ok, no problem. 
 agent: Thank you for reaching our service. 
 customer: Thank you for the information.
[EX A]: no_flight

[EX Q]: customer: Hello. 
 agent: Hello, how can I guide you for today? 
 customer: I'm Michelle Adams. I am planning to attend music concert at SFO, can you please help me with booking a flight ticket from PHX? 
 agent: Can you please share on what dates you are willing to travel? 
 customer: Sure, I would like to take off on 05/01 and return back on 05/03. 
 agent: Please give me a minute. 
 customer: Sure. 
 agent: Sorry, there are no flights available on your requested dates. 
 customer: Ok, no issues. Thank you for checking. 
 agent: Thank you for contacting us, have a nice day. 
 customer: You are welcome.
[EX A]:
no_flight