You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Owing to emergency, I need to change my recent reservation. Please help me in that.

ASSISTANT: Sure, may I know your good name please?

USER: My name is Carol Parker.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found on your name in our database to change.

USER: No problem, thanks for your information.

ASSISTANT: You are welcome.