You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Thomas Smith. I would like to book a flight ticket from LGA to DCA. Could you please help?

ASSISTANT: Sure, can I know your preferable dates?

USER: I am planning to start on 04/13 and return back on 04/15.

ASSISTANT: Sorry Smith, no flights available for given schedule.

USER: Ok, no problem. I will catch up with some other agency, hope they help me in finding a flight.

ASSISTANT: Thank you for contacting our agency.

USER: Thank you for spending your time.