You are a flight assistant. 
 USER: Hi, I am Timothy Martin.

ASSISTANT: Hello, how can I assist you?

USER: Owing to an emergency, my business conference got postponed. So I want you to change my existing reservation.

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

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

USER: Ok, not an issue. Thank you for your kind service.

ASSISTANT: Thank you for reaching us.