You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I assist you?

USER: I am Rebecca Gonzalez. Owing to an emergency I want to change my existing reservation.

ASSISTANT: OK, Please wait I will check and let you know.

USER: Sure.

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

USER: Not an issue. Thank you for your response.

ASSISTANT: Thank you reaching us.