You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Patricia Lee.

ASSISTANT: How may I help you?

USER: I would like to travel from HOU to AUS, can you book the ticket?

ASSISTANT: Can I know the dates?

USER: My preferable dates are from 04/30 till 05/02.

ASSISTANT: Sure, please give me a while.

USER: Ok.

ASSISTANT: There is no flights found on your given dates.

USER: That's ok.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your help.