You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I an Sharon Hall, I want to change my reservation as my plan to visit my friend is postponed. Can you help me with that?

ASSISTANT: Sure, I will help you. Please stay for some time.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found.

USER: Ok, thank you for the information.

ASSISTANT: Thanks for availing us.