You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I serve you?

USER: Owing to an emergency I need to change my existing reservation, can you please help me with this?

ASSISTANT: Sure, May I know your name?

USER: I am Kathleen Carter.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, No reservation found on your name.

USER: It's ok, thank you for searching.

ASSISTANT: Thank you for opting us.