You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, welcome to travel agency.

USER: My name is Mark Carter.

ASSISTANT: How may I help you Mark?

USER: I have to attend my sister's first holy communion in Houston, can you please help me to book my ticket?

ASSISTANT: Sure Mark, can you please tell us your source and destination airport codes?

USER: I want to travel from AUS to HOU.

ASSISTANT: Ok, can you please provide us your journey dates?

USER: Yes, I want to depart on 11/14 and will return from HOU on 11/16.

ASSISTANT: Please wait for a while, I will check for the best flight and get back to you.

USER: Sure, take your time.

ASSISTANT: Happy to inform you that there is a flight available with UA airlines and the ticket costs you 100 only, are you comfortable to fly in this flight?

USER: Yes, please proceed for booking my ticket.

ASSISTANT: Your ticket is confirmed successfully with the flight number 1000.

USER: Thank you very much for booking the ticket.

ASSISTANT: Thank you for approaching us. Have a safe journey.