You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: Can you book a flight ticket from IAD to ORD?

ASSISTANT: Sure, I am here to help you. May I know your travelling dates, please?

USER: I will start on Dec, 24 and return on Dec, 26.

ASSISTANT: Do you have any limit on number of connections?

USER: I would prefer single connection.

ASSISTANT: May I know about your other specifications for the journey?

USER: No more specifications.

ASSISTANT: Let me know your good name to proceed further.

USER: My name is William Gonzalez.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

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

USER: Please proceed.

ASSISTANT: Your flight has been reserved successfully.

USER: Thank you.

ASSISTANT: Thank you for choosing us, have a great day.