You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please change my existing reservation as my plan to go for holiday trip got postponed?

ASSISTANT: Sure, may I know your name?

USER: I am Lisa Clark.

ASSISTANT: We found your reservation, can you share me your new airport codes?

USER: I wish to board from JFK to reach PHX.

ASSISTANT: Ok, may I know your travelling dates?

USER: My planned journey dates are Dec 1 and Dec 3.

ASSISTANT: Is there any connection limit?

USER: Yes, I need a flight with single connection.

ASSISTANT: Do you have any other specifications?

USER: My return time should be afternoon.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: We found a connecting flight of American airlines in the economy class with fare 300, can I proceed for booking?

USER: You can proceed if it is having the return time as afternoon.

ASSISTANT: Your ticket is confirmed with flight number 1029 and return time at 14:00 PM.

USER: Thank you for your service.

ASSISTANT: Thank you for choosing us.