You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Rebecca Wright.

ASSISTANT: Ok.

USER: I need to reach Confluence Park which is in Denver at river side to study about minerals in it. Will you please help me with flight ticket booking from IAD to DEN?

ASSISTANT: Sure, may I know your dates of journey?

USER: Sure, I have planned to go on 09/10 and return will be on 09/12.

ASSISTANT: Please wait for a while, I will check and get back to you.

USER: Sure, take your time.

ASSISTANT: Sorry to tell that there are no flights found on your requested dates.

USER: It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for approaching us.