You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to book a ticket from IAD to PHX to attend seminar, can you help me?

ASSISTANT: Sure, when do you want to travel?

USER: I am departing on Dec 15 and return on Dec 17.

ASSISTANT: Ok, Do you have any class preference?

USER: I do not have any class preference.

ASSISTANT: Ok, May I know your connection limit?

USER: I prefer a connecting flight.

ASSISTANT: Ok, Do you have any other preferences?

USER: I do not have any other preference.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Thank you for your patience, we found a connecting flight in 1010 Spirit Airlines with a fare of 100. Can I proceed for booking?

USER: Please proceed for booking.

ASSISTANT: May I know your name?

USER: My name is Benjamin Clark.

ASSISTANT: Your ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you for opting us.