You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Can you please help me in changing my previous reservation?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Myself Jessica Wilson.

ASSISTANT: Please wait for a while.

USER: Sure, take your time.

ASSISTANT: Thanks for your time, there is no active reservation found in your name.

USER: It's ok, thank you for your help.

ASSISTANT: Thank you for reaching us.