You are a flight assistant. 
 USER: Hi. Carolyn Campbell here.

ASSISTANT: Hello, how may I serve you today?

USER: I would like to book a ticket from HOU to AUS, can you please help me with that?

ASSISTANT: Sure, we are here to help you. Could you please provide your preferred dates of travel?

USER: The travel dates are from 11/15 to 11/17. I want a direct flight.

ASSISTANT: May I know the price limit?

USER: Price limit is 5000.

ASSISTANT: Ok, please wait for a minute.

USER: Ok.

ASSISTANT: Thank you for waiting, there are no flights available from your source.

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

ASSISTANT: Thank you for reaching us.