You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Owing to an emergency, I want to change my reservation. Can you help me with that?

ASSISTANT: Sure, can I know your name?

USER: Sure, Charles Perez here.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: Ok, thanks for informing me.

ASSISTANT: Thank you for reaching us.