You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Gary Garcia, want to travel from LAX to HOU. Please help me in booking my ticket.

ASSISTANT: Sure, on which dates you are planning to travel?

USER: Sure, my trip dates are from 12/11 to 12/13.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Sorry Gary, there is no flights available.

USER: It's ok, thank you for your help.

ASSISTANT: Most welcome.