You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am Jessica Walker. Can you please help me in changing my recent reservation?

ASSISTANT: Sure, I will help you. Please wait for a moment, I will check and get back to you.

USER: Ok.

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

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for choosing us.