You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I want to change my existing reservation due to sudden change in my family trip dates. Can you help me out?

ASSISTANT: Sure, may I know your good name?

USER: I am George Martinez.

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

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for reaching us.