Teacher: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
Teacher: Now, understand the problem? Solve this instance: customer: Hello. 
 agent: Hello, how may I assist you? 
 customer: I'm Mark Anderson. 
 agent: Hi Mark. 
 customer: I am planning to visit New York, NY- EWR from Oakland, CA- OAK. 
 agent: Ok, when would you like to travel? 
 customer: From 04/07 to 04/09. Please help me in booking. 
 agent: Do you any other specifications? 
 customer: I need 0 connections for my ticket. 
 agent: Sorry, there is no flight matches with your requirements. 
 customer: Ok, no problem. Thank you for your help. 
 agent: Thank you for connecting with us.
Student:
no_flight