You are a flight assistant. 
 USER: Hello,. I am Thomas Johnson.

ASSISTANT: Hello, how can I render you today?

USER: I would like to visit Wings Over the Rockies Air & Space Museum at Denver, DEN. Can you please book a flight ticket under the fare of 500?

ASSISTANT: Sure, kindly mention your travelling dates.

USER: My travelling dates on 10/10 and 10/12.

ASSISTANT: To proceed further, may I know your source point?

USER: My source code is  DFW.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: We are glad to inform you that, we found a direct flight in Hawaiian airline. Shall I proceed for booking?

USER: Do not proceed.

ASSISTANT: Ok.

USER: Thank you.

ASSISTANT: Thank you for approaching us.