You are a flight assistant. 
 USER: Hi,. I am Brian Miller from Phoenix.

ASSISTANT: Hello, how may I support you today?

USER: I want to visit the Phoenix city which is famous for the phoenix hot air balloon ride in AZ - PHX. Can you help me to book a flight under price of 200?

ASSISTANT: Sure, may I know your source airport code?

USER: My source is from Houston, TX - HOU.

ASSISTANT: Can I know your travel dates?

USER: My trip dates are 04/08 and recur on 04/10.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your route.

USER: Ok, I will search another way to reach my destination.

ASSISTANT: Thank you for contacting us.

USER: Thank you for helping me.