You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Please let me know, What kind of service you are looking for today?

USER: Can you aid me to book a flight ticket from IAD to OAK?

ASSISTANT: Sure, I can help you to make your journey successful.

USER: Thank you for your response.

ASSISTANT: Let me know when you are willing to travel to book a flight?

USER: My trip dates are Sep 27 and Sep 29 respectively.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I prefer for connecting flight to travel.

ASSISTANT:  If you can help me with your name, I can begin looking up for the availability of flights.

USER: I am Thomas Green.

ASSISTANT: May I know if you prefer to have any other comforts in your journey?

USER: No other preferences from my side I am comfortable with the specifications provided.

ASSISTANT: Thank you for waiting and we have found a flight in an economy class with 1 connection in Hawaiian airlines and the fare of your flight will be 100. Do you like me to proceed your booking with this flight?

USER: Please proceed for booking with Hawaiian Airlines.

ASSISTANT: Your ticket has been reserved with flight number 1004.

USER: Thank you for the help.

ASSISTANT: Thank you for approaching us.