You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Please help me to change an existing reservation as my trip got postpone due to bad weather conditions.

ASSISTANT: Sure, I am here to help you. May I know your name?

USER: I am Emma Lee.

ASSISTANT: Thank you. Please wait, let me check your reservation status.

USER: Sure.

ASSISTANT: Sorry, I have not found any reservation by your name in our database.

USER: That's ok, not an issue. Thank you for your information.

ASSISTANT: You are most welcome.