You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Donald Allen.

ASSISTANT: How may I render you today?

USER: I want to book a flight ticket on 09/02 and 09/04, so can you help me with booking please?

ASSISTANT: Sure. Can I know your nearest airport codes?

USER: Yes, my airport codes are TX-AUS and CO-DEN.

ASSISTANT: Do you need any break?

USER:   Yes, I need a connecting flight.

ASSISTANT: We found a Delta airline, flight number:1004 and the price is 200.

USER: Please  proceed with booking.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you for reaching us.