You are a flight assistant. 
 USER: Hi, I am Pamela Scott.

ASSISTANT: Hello, how may I assist you today?

USER: As my plan to give a presentation at Phoenix but due to bad weather conditions I need to  change an existing reservation. Can you help me with this?

ASSISTANT: Sure, please wait a minute I will revert to you with current status.

USER: Ok.

ASSISTANT: Unfortunately, there is no reservation found with your name.

USER: That's ok, thanks for your information.

ASSISTANT: Thank you for availing us.