You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hi, how can I help you today?

USER: I have done a reservation last week but my journey destination got changed.Could you please change my existing reservation.

ASSISTANT: Sure, I can help you in that changing.Could you please provide your name?

USER: I'm Kimberly Thomas.

ASSISTANT: OK Thomas, will you please wait a moment to check it?

USER: OK, sure.

ASSISTANT: Thank you for waiting. Sorry Thomas based on your request there is no reservation found.

USER: OK. Thank you for your information.

ASSISTANT: OK, thank you for reaching us, have a great day.

USER: Your welcome.