You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ruth Walker.

ASSISTANT: How may I support you?

USER: I want o change my reservation, can you help me ?

ASSISTANT: Sure, I will help you. Please wait a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, we did not find any reservation on your name.

USER: Ok, thank you for information.

ASSISTANT: Thank you for availing us., have a great day.