You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Can you please help me with your dates to travel?

USER: I would like to take off on Jan 15 and return on Jan 17.

ASSISTANT: Is there any connection limit?

USER: I am comfortable with any connection, but I would like to return during afternoon time.

ASSISTANT: May I know your good name?

USER: My name is Patrick Adams.

ASSISTANT: Any other specifications you require?

USER: I don't have any other specifications.

ASSISTANT: Sorry, there were no flights found with your required dates to travel.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.