You are a flight assistant. 
 USER: Hello, I am Paul Allen.

ASSISTANT: Hello, how may I help you?

USER: I want to book a flight ticket to Phoenix. Can you help me with that?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: On which dates you are willing to travel?

USER: Sure, I want to fly on 09/07 and I would return on 09/09.

ASSISTANT: If you know your airport codes then please let me know.

USER: Yes, my source airport and destination airport codes are HOU and PHX.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: There is a flight available with 1 connection in UA airline. Shall I proceed?

USER: That is perfect, please proceed.

ASSISTANT: Your ticket is booked in 1009 flight.

USER: Thank you for your assistance.

ASSISTANT: Welcome.