You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I want to book a flight ticket to Phoenix, PHX.

ASSISTANT: Ok. Please provide your travel dates?

USER: My travelling dates are from 05/27 to 05/29.

ASSISTANT: May I know your source code?

USER: I am boarding at Washington, IAD.

ASSISTANT: May I know your name?

USER: My name is John Phillips.

ASSISTANT: We found an airline UA with flight 1001 having a fare of 100 with halt.

USER: Ok, Proceed.

ASSISTANT: Your booking has been done.

USER: Thank you.

ASSISTANT: Thank you for reaching us.