You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you at this moment?

USER: I am Jack Walker, willing to travel from my current location to Chicago to attend an interview.Can you assist me to book a flight ticket?

ASSISTANT: Can you please provide me your source and destination codes in detailed?

USER: My source is Seattle, WA - SEA and destination is Chicago, IL - ORD.

ASSISTANT: Ok, May I know your trip dates?

USER: My trip dates are 06/28 and 06/30.

ASSISTANT: Please wait for a minute.

USER: Ok, sure.

ASSISTANT: I found a flight with price 100 and 021 flight number. May I proceed?

USER: Yes, proceed.

ASSISTANT: Ok, your ticket has been confirmed.

USER: Thank you.

ASSISTANT: Most welcome.