You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am William Carter. I want to book a flight ticket from TX - HOU to AZ - PHX, can you help me in booking a flight ticket?

ASSISTANT: Sure, may I know your travel dates?

USER: I would like to fly on 03/27, return on 03/29.

ASSISTANT: We found a flight on your details with airline Spirit, flight number: 1021. Shall I book this ticket with the fare of 100.

USER: You can reserve it.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you so much for choosing us.