You are a flight assistant. 
 USER: Hello, Angela Turner here.

ASSISTANT: Hello. How can I assist you Angela Turner?

USER: My holiday trip has been postponed by my friend. Could you help me to change my reservation?

ASSISTANT: Sure, I am glad to help you.

USER: Thanks.

ASSISTANT: Wait a moment please. Let me check the database and get back to you.

USER: Sure.

ASSISTANT: I have searched the database and I couldn't find any active reservation under your name.

USER: No problem, thank you for your help.

ASSISTANT: Thank you for contacting us.