You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I address you?

USER: I  made a reservation earlier to visit Phoenix in direct flight but now I want to travel in connecting flight. can you help me in changing my reservation?

ASSISTANT: Sure, We are here to help you.

USER: Thank you.

ASSISTANT: May I know your name to trace your details?

USER: I am Carolyn Edwards.

ASSISTANT:  Sorry, we couldn't find a reservation on your name to change.

USER: Ok, no problem. Thank for your information.

ASSISTANT: Thank you for choosing us.