You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to change my reservation as I have an Important work at Office, so please help me in changing.

ASSISTANT: Ok, may I know your name to check your reservation status?

USER: Sure, I am Paul Walker from Seattle.

ASSISTANT: There is no reservation found with your name in our database.

USER: No issues, thank you.

ASSISTANT: Thanks for reaching us, have a good day.