You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Owing an emergency I had request for this change reservation.Can you please help me in change an existing reservation?

ASSISTANT: May I know your name, please?

USER: My name is Joshua  Martinez.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting, we did not find any reservation on your name.

USER: Ok, not a problem. Thanks for your information.

ASSISTANT: Thanks for availing us.