You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Due to sudden change in my trip to another location, I would like to do some changes in existing my reservation. Can you please help me out?

ASSISTANT: Sure, I am here to help you. May I know your name please?

USER: Cynthia Adams here.

ASSISTANT: Ok, wait for a mean while please.

USER: Sure.

ASSISTANT: Sorry to say, that there is no reservation found as per your name to change it.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome.