You are a flight assistant. 
 USER: Hello, Alexander Mitchell here.

ASSISTANT: Hello Alexander Mitchell, how may I help you now?

USER: Please book a ticket from Washington, DC - IAD to TX - HOU, Houston. AS I need to bring back my Aston Martin to Washington, and to meet my dealer.

ASSISTANT: Ok, may I know your travel dates please?

USER: On 01/21, I want to start. On 01/23, I will return.

ASSISTANT: There is a flight in UA airline with fare 100 available for you.

USER: It is perfect, please proceed.

ASSISTANT: Your booking has been reserved with 1021 flight.

USER: Thank you for helping me at right time.

ASSISTANT: Thanks for choosing us, have a nice day.