You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Anna King.

ASSISTANT: Ok.

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

ASSISTANT: Sure, I am here to help you. Please wait a minute.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry no reservation found on your name.

USER: Not an issue.

ASSISTANT: Thank you for reaching us, have a good day.

USER: Thank you.