You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I have to attend a musical event at New York, can you help me to book a flight ticket from LAX to LGA?

ASSISTANT: Sure, please provide your itinerary dates.

USER: My travelling dates are 11 and 13 of Mar.

ASSISTANT: Which class do you prefer?

USER: I am ok with any class.

ASSISTANT: May I know your name?

USER: I am Thomas Hill.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry Thomas Hill, no flights are available on your planned dates.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for choosing us.