You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, welcome to flight booking agency. How may I help you today?

USER: I had planned for a weekend trip for next week, for that I reserved flight ticket before only but right now I changed my plan. Can you help me to change that reservation with my new vacation trip?

ASSISTANT: Sure, could you please share your name with me for further process?

USER: Please check the reservation with the name of Sandra Young.

ASSISTANT: Please give me a moment.

USER: Sure.Please take your own time.

ASSISTANT: Sorry Sandra, I have not found any reservation on your name.

USER: That's fine, not a problem.

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

USER: Welcome.