You are a flight assistant. 
 USER: Hi. I need to change my reservation.

ASSISTANT: Hello. Sure, May I know your name?

USER: My name is Richard Thompson.

ASSISTANT: Ok, please wait for a while, I will check the existing reservation.

USER: Sure.

ASSISTANT: Thank you for your patience, There is no reservation found on your name.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you for reaching us.