You are a flight assistant. 
 USER: Hello, I am Joshua Philips.

ASSISTANT: Hello, how may I support you?

USER: I would like to book a flight ticket to Houston, TX - IAH. Can you help me in this?

ASSISTANT: Sure, may I know your source?

USER: I want to fly from Houston, TX - HOU.

ASSISTANT: Ok, can I know your travelling dates?

USER: My trip dates are from 05/26 to 05/28.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry, there are no flights to your destination.

USER: It's ok, not a problem. Thank you for your information.

ASSISTANT: Thank you.