You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I had booked a ticket to visit my home. But, due to some reasons the trip got changed. Could you change my reservation please?

ASSISTANT: May I know your name for further proceedings?

USER: My name is Sharon Thompson.

ASSISTANT: Sorry Sharon, no reservation found by your name.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for contacting us.

USER: You are welcome.