You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Debra King, want to travel from HOU to CLT.

ASSISTANT: What is your trip dates?

USER: My travelling dates are from 04/22 to 04/24.

ASSISTANT: There is no flights available.

USER: It's ok, thank you.

ASSISTANT: Welcome.