You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I have planned and reserved my ticket from ORD to AUS but I am not interested to go for AUS.so can you please change my existing reservation?

ASSISTANT: Sure, can you please mention your name for further process?

USER: My ticket is booked in the name of Jonathan Wilson.

ASSISTANT: Ok, please wait for a moment.

USER: Ok, sure.

ASSISTANT: Sorry Wilson, there is no reservation found on your name to change your reservation.

USER: Ok, fine.Thank you for your information.

ASSISTANT: Do you want any other help from me?

USER: No quires from my side.

ASSISTANT: Thank you for contacting us.

USER: Thank you.

ASSISTANT: You are welcome.