You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Justin Smith, I am planning to travel to Chicago for my birthday shopping. Can you make a reservation from Washington?

ASSISTANT: Sure, I am here to help you. May I know your dates travel to find a flight for you?

USER: My journey dates are on Feb 7 and Feb 9.

ASSISTANT: Ok, can I have your airport codes too?

USER: My travel codes are from IAD to ORD.

ASSISTANT: May I know your class preferences?

USER: I prefer to travel in economy class.

ASSISTANT: Sorry, there is no flight found on your route to book your ticket.

USER: Ok, thank you.

ASSISTANT: Welcome, have a good day.