You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Jeffery  Johnson.

ASSISTANT: How may I guide you?

USER: I want to book a flight ticket from DC-IAD to AZ-PHX. Can you help me ?

ASSISTANT: Sure, I will help you. May I know your preferable journey dates?

USER: 06/01 and 06/03 are my travelling dates.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Johnson, I found a flight for you in Delta airlines with fare 200. Can I proceed?

USER: Yes, you can reserve it.

ASSISTANT: Ok, your booking is confirmed with flight number 1011.

USER: Thank you.

ASSISTANT: Thank you for choosing us.