You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to book a flight ticket to San Francisco as I need to submit my research record. Can you do the reservation?

ASSISTANT: Sure, may I know your airport codes?

USER: My airport codes are Charlotte, CLT to San Francisco, SFO.

ASSISTANT: When do you want to travel to SFO and return back?

USER: Dates are 04/18 and 04/20.

ASSISTANT: Do you have any specification?

USER: I need halt in my journey.

ASSISTANT: We found a flight on your details with airline UA, flight number: 1018. Shall I proceed for booking?

USER: Go ahead.

ASSISTANT: May I know your good name please?

USER: Amanda Miller here.

ASSISTANT: Your ticket has been booked.

USER: Thank you so much.

ASSISTANT: Thanks for choosing us.