You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I want to change my existing reservation, can you please help me with this?

ASSISTANT: Sure, can you please let me know your name to check with the reservation status?

USER: My name is James Roberts.

ASSISTANT: Thank you for confirming your name. Please allow me 2-3 minutes.

USER: Ok.

ASSISTANT: Thank you for waiting, James Roberts.

USER: No problem, thank you.

ASSISTANT: Sorry, there is no active reservation found under your name to change.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for reaching us.