You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kimberly Edwards.

ASSISTANT: How can I help you Kimberly Edwards?

USER: : Due to sudden change in the dates of summit which was going to be held in the place, I want to do some changes in my existing reservation, can you please help me out?

ASSISTANT: Yes, I am here to help you. Wait a moment please.

USER: Sure.

ASSISTANT: Sorry to say, there is no reservation found with your name. Is anything else I may assist you?

USER: That's fine.

ASSISTANT: Thank you for reaching us.

USER: No thanks. Thank you for your help.