You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Melissa Moore here.

ASSISTANT: How can I help you?

USER: Can you please help me in booking a flight ticket from DEN to DFW?

ASSISTANT: May I know your desired travel dates please?

USER: Sure, my travel dates are from Nov 23 to Nov 25.

ASSISTANT: Do you have any specifications?

USER: I would like to arrive in the morning.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

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

ASSISTANT: Thank you for opting us.