You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Deborah Garcia. I want to travel from DCA to DEN. Can you book a flight ticket for me?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: I want to fly in the flight on 12/16 and 12/18.

ASSISTANT: Please wait for a moment.

USER: Ok, take your own time.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for approaching us.