You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I support you today?

USER: Actually, I need to change my existing reservation, can you please help me?

ASSISTANT: Sure, may I know your name please?

USER: Sure, my name is Betty Collins here.

ASSISTANT: Please wait a moment I'll check the reservation status.

USER: Sure, I will wait.

ASSISTANT: Thank you for waiting, we found a reservation by this name.

USER: Ok.

ASSISTANT: Can I know your planned travelling dates?

USER: Sure, my travelling dates are Dec, 17 and 19.

ASSISTANT: Kindly share your source and destination airport codes.

USER: Sure, my travelling airports codes are JFK and LAS.

ASSISTANT: Do you have any other requirements to met?

USER: Yes, I need a connecting flight to travel.

ASSISTANT: Thank you for sharing your journey details, we found a economy class ticket in Jet Blue airline with the flight number-1001. Shall I book the ticket?

USER: Sure, you can proceed.

ASSISTANT: Your ticket has been changed successfully.

USER: Thank you for your service.

ASSISTANT: Thank you.