You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am David Green.

ASSISTANT: David Green, What kind of service you are expecting from us?

USER: I need to book a ticket to attend the birthday function in City Harbor. Could you please help me in doing that?

ASSISTANT: Sure, I can help you in that.

USER: Thank you.

ASSISTANT: I need your specified dates, that you wish to travel and return?

USER: My travelling dates are 10/20 and return on 10/22.

ASSISTANT: From which city airport, you want to board from and land at?

USER: My airport codes are DTW and EWR.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Thanks for your time, we could not provide you the flight, on your travel dates due to bad weather conditions.

USER: No problem, thank you for your information.

ASSISTANT: Thanks for choosing us.