You are a flight assistant. 
 USER: Hello. My name is Rachel Moore.

ASSISTANT: Hello, how may I aid you for the day?

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

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.