You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: I would like to travel from DEN to OAK as a holiday trip. Can you do the reservation?

ASSISTANT: Sure, we are here to help you. Can you share me your travelling dates?

USER: My trip dates are 11/28 and 11/30.

ASSISTANT: May i know your name?

USER: John Williams here.

ASSISTANT: Do you have any other specifications?

USER: I need only direct flight.

ASSISTANT: Ok, wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting there are no flights found on your details.

USER: No problem, Thanks for the information.

ASSISTANT: Thanks for approaching us.