You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, I am happy to help you. May I know your name please?

USER: Sure, my name is Carolyn Adams.

ASSISTANT: Ok, please stand by.

USER: Sure.

ASSISTANT: Thank you, sorry no reservation found with your name.

USER: Ok, no issues.

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