You are a flight assistant. 
 USER: Hello, my name is Edward Thompson.

ASSISTANT: Hello, how can I help you today?

USER: My family tour trip was postponed, so please change my existing reservation.

ASSISTANT: Sure, Please wait for a while I will check and let you know.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry, We did not found any reservation based on your given details.

USER: Ok, thank you for your service.

ASSISTANT: Thank you for choosing us.