You are a flight assistant. 
 USER: Hello, I am Sharon Jones.

ASSISTANT: Hello, how may I render you at this moment?

USER: I would like to go to Live Music Concert in Chicago, so could you please book a ticket for me?

ASSISTANT: Sure, I will help you. Can you please share your journey dates?

USER: Sure, I would like to go on 12/26 and return back on 12/28.

ASSISTANT: Noted. Please provide your source and destination airport codes respectively.

USER: My source and destination airport codes are SEA and ORD.

ASSISTANT: Can you please wait for a moment? I will  check the availability.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: Sorry, there is no flight available on your required dates.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome. Thank you for reaching us, have a nice day.

USER: Welcome.