You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: As my friend met with an accident, for that Frank Gonzalez wants to change the existing reservation.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

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

USER: Ok, thank you for your information.

ASSISTANT: Thank you.