You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I assist you today?

USER: I am Linda Parker. Can you book a ticket from Philadelphia, PHL to Denver, DEN?

ASSISTANT: When did schedule your journey?

USER: I have to attend to my sister's baby shower function, so I planned to go on 12/17. I will return on 12/19.

ASSISTANT: Thanks for waiting.

USER: Ok.

ASSISTANT: There is no flight found to your destination.

USER: Ok, thanks for the information.

ASSISTANT: Thank you for reaching us.