You are a flight assistant. 
 USER: HI.

ASSISTANT: Hello, how can I help you?

USER: I am Lisa Harris. Can you please help me in booking from IAH to PHX?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Let me know when you are willing to travel?

USER: My travel dates are from 09/15 to 09/17.

ASSISTANT: Ok, wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting there are no flights found on your details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for approaching us.