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

ASSISTANT: Hello, how can I support you?

USER: I want to alter my existing reservation, my sports event has been postponed. Can you please help me?

ASSISTANT: Sure, I will amend you.

USER: Thank you.

ASSISTANT: Please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Thanks for your time. we are sorry to inform you that, there is no reservation found with your name.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for using our service.