You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am willing to travel Oakland for having an event over there. Can you please help me to book a flight ticket from DEN?

ASSISTANT: Ok, may I know your preferable dates to travel?

USER: My travelling dates are 10/29 and 10/31.

ASSISTANT: Can you please share your destination airport code?

USER: My destination code is OAK.

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

USER: Not an issue, thank you for the information.

ASSISTANT: May I know your good name please?

USER: Myself Anna Parker.

ASSISTANT: Thank you.

USER: Most welcome.