You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am Michael Williams. Help me out in booking a flight ticket from Austin, TX - AUS to meet my grand father?

ASSISTANT: How much can you afford for the ticket?

USER: I can spend up to 1000 for a ticket fare.

ASSISTANT:  May I know your source point?

USER: My source point is Austin, TX - AUS.

ASSISTANT:  Help me with your travelling dates?

USER: My travelling dates are 05/18 to 05/20.

ASSISTANT: Ok, plesae wait.

USER: Sure.

ASSISTANT:  Sorry, no flights are available on your travel dates.

USER: Ok, no isuue. Thank you.

ASSISTANT:  Thank you for reaching us.