You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you today?

USER: I am Jerry Adams. I want to change an existing reservation due to sudden change in my trip. Can you help me?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, we found a reservation with your name to change. Let me know your new journey details?

USER: OAK and EWR are my preferable airport codes. 03/20 and 03/22 are my travelling dates.

ASSISTANT: We found a connecting flight with fare of 100 in Spirit airline.

USER: You can reserve it.

ASSISTANT: Shall I proceed for booking? Your ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thanks for opting us.