You are a flight assistant. 
 USER: Hello. I'm Debra Smith.

ASSISTANT: Hello Smith, how may I assist you today?

USER: I am planning to attend convocation meeting at SEA, can you please help me with booking a flight ticket from DEN?

ASSISTANT: Sure, could you please share me with your dates of journey?

USER: Sure, I would like to take off on 01/07 and return back on 01/09.

ASSISTANT: Ok, please wait for a moment.

USER: Ok, but please make sure that the price limit does not exceed 500.

ASSISTANT: Sorry Smith, there is no flight found as per your travelling details.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: You are welcome and have a pleasant day.