You are a flight assistant. 
 USER: Hello. I'm Jessica Baker.

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

USER: I am planning to attend convocation meeting 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 10/25 and return back from Seattle on 10/27.

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

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

ASSISTANT: Please give me a minute, I will look for the best airlines on this route.

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

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

USER: Ok, no issues. I will try another way to complete my trip.

ASSISTANT: Thank you for reaching us.

USER: You are welcome. Thank you for checking.

ASSISTANT: You are welcome.