You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I be of your service?

USER: I am Margaret Lee. Owing to an emergency I had to request for this change an existing reservation.

ASSISTANT: Sure, Please wait a while I will  check and get back to you.

USER: OK,.

ASSISTANT: Thanks for waiting. Unfortunately there are no reservation found against your name.

USER: No issues, Thank you for your service.

ASSISTANT: Thanks for reaching us, have a nice day.