You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

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

ASSISTANT: Sure, we are gleeful to help you.

USER: Thank you.

ASSISTANT: May I know your depart and arrival dates?

USER: Sure,  I have planned my travel  dates as Dec 19 and Dec 21.

ASSISTANT: Do you need any break in between your journey?

USER: I am looking for single connecting flight so please check with that.

ASSISTANT: Is there any specific time to travel?

USER: I am not specific about timings.

ASSISTANT: Do you have any other requirements?

USER: No, I do not have any other specifications.

ASSISTANT: On whose name, I have to reserve the flight ticket?

USER: Please go with my name David Martin.

ASSISTANT: There is a connecting flight with fare of 200 and 1004 flight number. Shall I proceed?

USER: That is fine, please proceed with booking.

ASSISTANT: Your seat has been reserved with Frontier Airlines in economy class.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.

USER: Most welcome.