You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Kathleen Nelson.

ASSISTANT: OK.

USER: Can you change my existing reservation?

ASSISTANT: Sure, please wait. i will check your reservation.

USER: Sure.

ASSISTANT: Sorry, no reservation has been found with your name.

USER: Ok, No issues. Thank you.

ASSISTANT: Thanks for reaching us.