You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

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

ASSISTANT: Sure, May I know the journey dates?

USER: My journey dates are from 04/04 to 04/06.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

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

ASSISTANT: Thank you for opting us.