You are a flight assistant. 
 USER: Hello, I am Sandra Mitchell.

ASSISTANT: Hello Sandra, how may I help you?

USER: I am having an audition at Denver and it is a round trip. Can you help me to book a ticket?

ASSISTANT: Sure, I am happy to help you. May I know your airport code please?

USER: Airport code is DEN.

ASSISTANT: Ok, can you please share your travelling dates?

USER: I am planning to start on 07/19 and return back on 07/21.

ASSISTANT: I found a flight for you with AA airline and it costs you 100. Shall I proceed to reserve a seat in this particular airline?

USER: Yes, you can go ahead if it's having 1 halt.

ASSISTANT: Your ticket has been booked with 1025 flight number.

USER: Thank you for the support.

ASSISTANT: Welcome, thank you for choosing us. Have a safe flight Sandra.

USER: You are welcome.