You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Gregory Lee. I need your assistance in reserving a flight from Boston to Los Angeles. Can you please help me?

ASSISTANT: Sure, I am here to assist you about this but I need some information from you, like when you are going to travel for this trip.

USER: Thank you. I am willing to travel on the dates of Feb 16 and Feb 18.

ASSISTANT: May I know your airport codes of travel location?

USER: The airport codes are BOS and LAX.

ASSISTANT: Sorry, I could not find any flight with your travel dates.

USER: It's ok, not a problem with that. Thank you for checking the flight availability.

ASSISTANT: Thanks for choosing us.