You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Could you please help me to change an existing reservation as my trip got postpone due to bad weather conditions?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: May I know your good name?

USER: I am Joshua Campbell.

ASSISTANT: Please wait for a while.

USER: Sure.

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

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you  for choosing us.