You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Donald Martinez.

ASSISTANT: Donald, how can I aid you today?

USER: I am looking to book a flight ticket to meet my friend in Phoenix. Can you help me for booking a flight ticket from LGA to PHX?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: My travelling dates are Nov 29 and Dec 01.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry Donald, there are no flights available on your requested dates.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.