You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: Will you please help me in booking a flight from DFW to meet my cousin at New York?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: Sure, my travelling dates are on Dec 17th to 19th.

ASSISTANT: Ok, can you please provide your destination airport code?

USER: My destination airport code is EWR.

ASSISTANT: Ok, do you have any specifications?

USER: I would like to depart in evening time.

ASSISTANT: Ok, may I know your name please?

USER: Sure, my name is William Clark.

ASSISTANT: Sorry William Clark, there are no flights available on your requested dates.

USER: No issues, thank you.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.