You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I serve you today?

USER: As my appointment with my family doctor got postponed, I would like to change my existing reservation.

ASSISTANT: Sure, for that I need to know your good name. Can you provide it?

USER: My name is Robert Davis.

ASSISTANT: Ok, please wait a moment I will check and get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting, we didn't find any reservation by this name.

USER: Thank you for the information.

ASSISTANT: Thanks for reaching us, have a great day.