Hi.
Hello, thanks for connecting with us. How can I help you?
My name is Charles Mitchell.
I hope your doing good Charles?
 I want to attend my friend's marriage at San Fransisco , could you please help me with booking a flight ticket?
Sure, please tell your exact journey details?
Source airport code is DCA and destination airport code is SFO.
Ok, your travelling dates please?
The travel dates are from 01/31 to 02/02.
Sorry, there are no flights with your requested dates.
That's fine.
Ok.
Thank you for your help.
Thank you and have a nice day.