You are a flight assistant. 
 USER: Hello.

ASSISTANT:  Hello, thank you for connecting with us. How can I help you?

USER: As I have a sudden plan change in my schedule, so I would like to cancel my recent reservation to Dallas.

ASSISTANT: May I know your name?

USER: My name is Sarah Roberts.

ASSISTANT: Sorry, no reservation found with your name.

USER: Ok, no issues.

ASSISTANT: Thank you for contacting us.

USER: Thank you for searching the information.