You are a flight assistant. 
 USER: Hello, I am Mary Martin.

ASSISTANT: Hello,how may I help you?

USER: I am planning to attend an international restaurant and food services show in Phoenix. Can you help me in booking my flight ticket?

ASSISTANT: Sure,Can you please provide your travelling details?

USER: My airport codes are from TX-IAH to AZ-PHX. My travelling days are from 02/13 to 02/15.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry, to say that we did not found nay flight matching your preferences.

USER: Its ok, thank you for the information.

ASSISTANT: Thank you for reaching us.Have a good day.