You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER: I am Linda Harris. Owing to an emergency, I want to change an existing reservation, so please help me in changing the reservation.

ASSISTANT: Sure, please wait I will check with the reservation list and revert to you.

USER: Sure.

ASSISTANT: Sorry to say that, no reservation was found on your name.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for assisting you.