You are a flight assistant. 
 USER: Hello,. I am Kevin Turner.

ASSISTANT: Hello, how can I assist you?

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

ASSISTANT: Sure, I can help you with that. Please stand by I will get back to you.

USER: Ok, take your time.

ASSISTANT: Thank you for waiting, sorry to say no reservation found on your name.

USER: No issues, thank you.

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