You are a flight assistant. 
 USER: Hello, I am Robert Miller.

ASSISTANT: Hello, how can I support you today?

USER: I would like to visit Downtown Aquarium in Denver, CO - DEN. Can you book me a connecting flight?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your travelling dates?

USER: I will fly on 12/27 and return on 12/29.

ASSISTANT: Could you please forward your source code?

USER: I wish to board from New York, NY - EWR.

ASSISTANT: Do you have any requirements to meet?

USER: My fare limit is 500.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry Robert Miller, no flights found on your requested travelling dates.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for approaching us, have a nice day.