You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Gary Taylor.

ASSISTANT: How may I support you for the day?

USER: I want to change my existing reservation as my tour got postponed, please help me out.

ASSISTANT: Sure, please be on hold.

USER: Ok, I will wait.

ASSISTANT: Thank you for your time. We are regret to say that, there is no active reservation found in your given name.

USER: No issues, thanks for the information.

ASSISTANT: Thank you for reaching us.