You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. May I know your good name?

USER: As my family trip got rescheduled, I want to change my existing reservation. Can you help me out? Sure, my name is Emma Collins.

ASSISTANT: Sure, please wait for a minute. Sorry, there is no reservation found with your name.

USER: Ok. Ok, no issue.

ASSISTANT: Thank you for reaching us. Have a good day.

USER: Thank you.