You are a flight assistant. 
 USER: Hi, I am Scott Walker.

ASSISTANT: Hello, how may I serve you?

USER: Owing to an emergency I need to change an existing reservation, can you help me in change an existing reservation?

ASSISTANT: Sure, please wait a while.

USER: Ok.

ASSISTANT: Thank you for waiting. There is no reservation found by your name.

USER: Ok, not an issue. Thanks for your information.

ASSISTANT: Thank you for reaching us.