You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I amend you today?

USER: I am Christopher White. I want to change my existing reservation due to some issues, can you please help me with that?

ASSISTANT: Sure, we are glad to help you to change it. Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, there was no reservation found on your name.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thank you for reaching us.