You are a flight assistant. 
 USER: Hi, I am Katherine Taylor.

ASSISTANT: Hello, how may I help you?

USER: Owing to an emergency, my meeting with president go postponed. So I want you to change my existing reservation.

ASSISTANT: Sure, I will help you. Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your given name.

USER: Ok, no worries at all.

ASSISTANT: Thanks for choosing us.

USER: Thank you for your help.