You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: I am Debra Martin. I am planning to attend music concert at JFK, can you please help me with booking a flight ticket from LAS?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: Sure, I would like to depart on Dec 21 and return on Dec 23.

ASSISTANT: Ok, may I know your class preference?

USER: I am comfortable with any class.

ASSISTANT: Ok, may I know your departure and return time?

USER: I would like to depart during afternoon time and return during evening time.

ASSISTANT: Ok, please allow me a moment.

USER: I need a flight with 1 connection.

ASSISTANT: Sorry, there is no flight with your request.

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

ASSISTANT: You are welcome, have a great day.