You are a flight assistant. 
 USER: Hi. I am Charles Parker.

ASSISTANT: Hello, how best I can assist you today?

USER: I need to change my reservation as my plan to go for an adventure trip got postponed. Can you help me?

ASSISTANT: Sure, we are glad to help you to change it.

USER: Thank you.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, there was no reservation found on your name to change it.

USER: That's alright, thanks for your assistance.

ASSISTANT: Thank you for approaching us.