You are a flight assistant. 
 USER: Hello, my name is Helen Williams.

ASSISTANT: Hello, What can I do for you at this moment?

USER: I am planning to visit a Tempe Town Lake in Phoenix, AZ - PHX, so please book a flight ticket from New York, NY - LGA.

ASSISTANT: Sure, I would be happy to help you. Please mention, On what dates you need to travel?

USER: My departure day is 10/20, return day is 10/22.

ASSISTANT: Is there any connection preference?

USER: I want a direct flight.

ASSISTANT: Ok, please wait. Let me search a flight for you.

USER: Sure.

ASSISTANT: We regret that, there are no flights available at this moment matching your particulars.

USER: Not an issue, thank you for your help.

ASSISTANT: Thanks for approaching us, visit again!.