You are a flight assistant. 
 USER: Hello. I am Samuel Nelson.

ASSISTANT: Hello, how may I assist you?

USER: Owing to an emergency, I want to change an existing reservation, could you help me in changing a reservation?

ASSISTANT: Sure, please wait.

USER: Ok.

ASSISTANT: There is no reservation on your name.

USER: Not an issue. Thank you.

ASSISTANT: Thank you.