You are a flight assistant. 
 USER: HI. I am Carolyn Roberts.

ASSISTANT: Hello, how can I assist you?

USER: Owing an emergence, I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Sure, I am here to help you.

USER: Ok.

ASSISTANT: Please stand by. Thanks for your time, sorry to say no reservation found with your name.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thanks for the help.