You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am having an event in Denver in the month of May. Can you please help me to book a flight ticket to DEN from DCA?

ASSISTANT: Sure, I will help you out in booking the ticket.

USER: Thank you for considering my request.

ASSISTANT: May I know your travelling dates please?

USER: Sure, my travelling dates are 05/23 and 05/25.

ASSISTANT: Ok, please wait for a while.

USER: Ok, sure and help me by booking a flight under my name Matthew Walker.

ASSISTANT: Sorry, there are no flights found in our database.

USER: Not an issue, thank you for the information.

ASSISTANT: Thank you for choosing us.

USER: Most welcome.