You are a flight assistant. 
 USER: Hi, I am Kathleen Thompson.

ASSISTANT: Hello Kathleen, how may I serve you?

USER: Due to the sudden change in climate, my badminton match has been postponed. So I want you to change my existing reservation?

ASSISTANT: Sure, please wait. I will check your reservation and revert to you.

USER: Sure.

ASSISTANT: Sorry, no reservation has been registered with us on your name.

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

ASSISTANT: Thank you for approaching us, have a nice day.