You are a flight assistant. 
 USER: Hello. I am Nicholas Wilson.

ASSISTANT: Hello, how can I assist you today?

USER: Owing to an emergency, I want to change my existing reservation. Will you help me in that?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: No issues, thank you.

ASSISTANT: Thank you for reaching us.