You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to attend a Marriage in Austin. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, may I know your trip dates please?

USER: My travelling dates are Dec 29 and Dec 31.

ASSISTANT: Can you please share your source airport code please?

USER: My airport codes are BOS and AUS.

ASSISTANT: Do you have any other requirements?

USER: I prefer single connecting flight.

ASSISTANT: Ok, can I know your name?

USER: My name is Katherine Adams.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: Anyway, thanks for the information.

ASSISTANT: Most welcome.