You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am planning to go for LGA, please search a flight ticket for me?

ASSISTANT: Sure, please tell me your trip dates.

USER: My travelling dates are 11/25 and 11/27.

ASSISTANT: Sure, please tell me your source location.

USER: My source location airport code is EWR.

ASSISTANT: Ok, may I know your name please?

USER: Myself Gregory Carter.

ASSISTANT: Carter, all plane tickets are sold out in your planned month.

USER: Ok, fine Thank you for searching for me.

ASSISTANT: My pleasure.