You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Due to emergency health issue I want to change my existing reservation. Can you help me out?

ASSISTANT: Sure, Kindly mention your name?

USER: I am Jeffery Thompson.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: Ok, no issue.

ASSISTANT: Thanks for reaching us, have a good day.

USER: Thanks for your service.