You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Actually my exam is postponed so that I want change my existing reservation, can you help me?

ASSISTANT: Sure. Can you please provide me your name?

USER: Yes, I am Barbara Jones.

ASSISTANT: Please wait a moment Jones.

USER: Ok, sure.

ASSISTANT: Jones, I didn't find any reservation with your details.

USER: Ok, no problem. Thank you for your help.

ASSISTANT: Thank you for reaching us Jones.