You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I want to visit the famous church in Austin. Can you help me to book a flight ticket on the name Catherine Thomas?

ASSISTANT: Sure, I will help you with that. Sure Thomas, when you are planning to travel?

USER: Sure, I have planned to fly on 05/28 and return date is on 05/30.

ASSISTANT: Ok, may I know your nearest airport code and the destination airport code please.

USER: Yes, my travel codes are LAX and AUS.

ASSISTANT: Ok, give me a moment please. Sorry Thomas, no flight available based on your preferable dates.

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

ASSISTANT: Thank you for contacting us.