You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you help me to book a flight ticket from LGA to PHX?

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travel dates?

USER: My trip dates are Aug 19 and Aug 21.

ASSISTANT: Ok, please mention your name.

USER: I am Jason Allen.

ASSISTANT: Sorry, no flights are available on your preferable travel dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day.