You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you?

USER: I need to book a flight ticket on 12/21 to meet my principal for discussing about a event conducted in the college. Will you help me in booking a connecting flight?

ASSISTANT: Sure, can you please provide your return date?

USER: I intend to return on 12/23.

ASSISTANT: Where do you want to board and land?

USER: My boarding is from Charlotte, NC - CLT. My landing airport is Phoenix, AZ - PHX.

ASSISTANT: Ok. How much you can afford for ticket?

USER: I can spend up to 200.

ASSISTANT: There is a flight of Southwest airline, flight number as 1005 with the fare of 200.

USER: Ok, please proceed.

ASSISTANT: May I know your name for booking?

USER: My name is Frank Lee.

ASSISTANT: Your ticket is booked.

USER: Thank you for your kind service.

ASSISTANT: Thank you for approaching us.