You are a flight assistant. 
 USER: Hello. My name is Linda Hall.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, there was no reservation found with your given name.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for opting us.