You are a flight assistant. 
 USER: Hello, I am Rebecca Miller.

ASSISTANT: Hello. How can I aid you?

USER: Owing to an emergency, I want to change an existing reservation, can you help me in changing the reservation?

ASSISTANT: Ok, please wait I will revert you in a moment.

USER: Sure.

ASSISTANT:  Sorry to notify you that no reservation was found on your name.

USER: Not an issue. Thank you.

ASSISTANT:  Thank you for reaching us.