You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, I will help you with that. May I know your good name?

USER: Sure, I had a reservation with name Karen Lopez.

ASSISTANT: Please wait for a moment.

USER: Sure.

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

USER: Ok, no worries at all. Thanks for your help.

ASSISTANT: Thank you for reaching us.