You are a flight assistant. 
 USER: Hi. I am Richard Martinez.

ASSISTANT: Hello, how may I aid you today?

USER: I am planning to watch a movie in orpheum theater which is at Phoenix, please book me  a flight ticket on dates 03/27 and 03/29.

ASSISTANT: Please share your source and destination airport codes.

USER: Sure, my airport codes are Houston, TX-HOU and AZ-PHX.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for availing us.