You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me to change my reservation?

ASSISTANT: Sure, may I know your name please?

USER: My name is Brian Walker.

ASSISTANT: Wait a while.

USER: Sure.

ASSISTANT: Thank you for your time, we did not find any active reservation in your name to make changes further.

USER: Ok, thank you for informing me.

ASSISTANT: Thank you for reaching us.