You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I have reserved flight ticket but unfortunately my family was not accepting to travel particulate dates so, can you please help me to change my active reservation?

ASSISTANT: We are at your service, can you provide me your name please?

USER: Sure, my name is Patrick Jones.

ASSISTANT: Please may I have your time?

USER: Sure.

ASSISTANT:  Patrick Jones. I have checked with the system, sorry to say there is no reservation by your name.

USER: That's ok, no problem. Anyway thank you for checking.

ASSISTANT: Thank you for reaching us.