You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Michelle Baker.

ASSISTANT: How can I assist you?

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

ASSISTANT: Sure, can I know the travel dates please?

USER: Sure, I would like to take off on Dec 22 and return on Dec 24.

ASSISTANT: Could you please provide the departure and return time?

USER: I would like to return during afternoon time.

ASSISTANT: Do you have any requirements?

USER: I need a flight with 1 connection.

ASSISTANT: Sorry, there are no flights available as per your request.

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

ASSISTANT: Thank you for approaching us.

USER: You are welcome.