You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I support you?

USER: I'm Jacob Baker. Owing to an emergency, I need to change existing reservation.

ASSISTANT: Sure, I can help you with that. Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting. There was no reservation found on your name.

USER: Thanks for the help.

ASSISTANT: Thank you for reaching us.