You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?\.

USER: My name is Raymond Hernandez. I would like to change my existing reservation, which is done recently. Can you please help me out?

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you for considering my request.

ASSISTANT: Please give me a moment to check your reservation status.

USER: Sure, take your time.

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

USER: Not a big problem, anyway thank you for the information.

ASSISTANT: Thank you for reaching us.

USER: Thank you for checking.