You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: My name is Larry Thompson, I want to book a flight ticket from BOS to HOU, can you help me with booking?

ASSISTANT: Ok, may I know your travelling dates?

USER: My travelling dates are Sept 26 to Sept 28.

ASSISTANT: Do you like to go with a economy class or business class?

USER: I am comfortable with any class.

ASSISTANT: May I know your other specifications?

USER: I prefer to depart in the afternoon time.

ASSISTANT: Sorry, we don't have any flight available for your trip.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for choosing us.