You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am George Roberts. I would like to change my recent reservation, can you help me with this?

ASSISTANT: Sure, please wait a moment I will check your reservation details and proceed further.

USER: Sure, take your own time.

ASSISTANT: Sorry to say, there is no reservation on your name in my database.

USER: That's ok, not a issue.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Anyways thanks for your information.