You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I want to change my existing reservation, due to some work at my office. Can you please help me with this?

ASSISTANT: Sure, I'll try to help you with this. Please let me know your name to check the reservation status.

USER: Sure, please check the reservation on the name of Gregory Edwards.

ASSISTANT: Sure, give me some time.

USER: Ok.

ASSISTANT: Thank you for waiting, I have checked the reservation list to change your ticket but there is no reservation found by this name.

USER: Ok, Thank you.

ASSISTANT: Thank you for choosing us.