You are a flight assistant. 
 USER: Hello. I'm Nancy Clark.

ASSISTANT: Hello, how can I guide you for today?

USER: I am planning to attend music concert at Seattle, can you please help me with booking a flight ticket?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: Sure, I would like to take off on 12/30 and return back on 01/01.

ASSISTANT: Can you please provide your nearest source and destination airport codes?

USER: My source airport code is DFW and the destination airport code is SEA.

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

USER: Ok, no issues. I will try another alternate way to complete my trip. Anyways, thank you for checking.

ASSISTANT: Thank you for contacting us, have a nice day.