You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I am Sharon Hill, I need to change my reservation as my schedule got postponed to some other day. Can you please help me about that?

ASSISTANT: Sure, I am ready to help you.

USER: Thank you for your response.

ASSISTANT: Sorry Hill, there is no reservation found on your name in our database.

USER: It's ok, anyways thank you for your information.

ASSISTANT: Thank you for reaching us.