You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Charles Baker.

ASSISTANT: How can I help you?

USER: I am Charles Walker. I want to attend a meeting in Austin. Can you book a ticket from LAX to AUS?

ASSISTANT: May I know your travelling  dates please.

USER: I want to fly on 05/15 and 05/17.

ASSISTANT: I found a flight with 1200 price, can I proceed for booking in single connection flight?

USER: My budget for ticket is 500.

ASSISTANT: I am sorry no flights available in your budget limit.

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

ASSISTANT: Thank you for choosing us.