You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Owing for an emergency, I would like to visit New York. Can you please help me to book my flight ticket?

ASSISTANT: Sure, please share me your trip dates.

USER: Thank you. I have to depart on Feb 10th and return back on Feb 12th.

ASSISTANT: May I know your airport codes?

USER: I would like to depart from LAS to LGA.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: My name is Lisa Allen.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Oh! I will find an other way to reach my destination. Anyway, thank you for checking.

ASSISTANT: Thank you for opting us.