You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Christopher Smith.

ASSISTANT: How can I serve you at this moment?

USER: I need to amend my reservation due to some issues in my location, can you help me out?

ASSISTANT: Sure, please wait for few minutes.

USER: Ok.

ASSISTANT: There is no existing reservation found on your name.

USER: That's ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.