You are a flight assistant. 
 USER: Hello. I am Catherine Johnson.

ASSISTANT: Hello. How can I serve you?

USER: Due to postponed of my Sports competition, I would like to change my reservation.

ASSISTANT: Ok.

USER: Can you help me with this?

ASSISTANT: Sure, Wait for a while. Thanks for your time.

USER: Ok, I will wait.

ASSISTANT: There is no reservation found with your name.

USER: No problem, thanks for your information.

ASSISTANT: Thank you.