You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Due to some technical issues, my meeting has been postponed. Can you please change my existing reservation?

ASSISTANT: Sure, may I know your name?

USER: Sure, I am Jason Lopez.

ASSISTANT: Ok, please wait a moment.

USER: Ok, I will wait.

ASSISTANT: Thanks for waiting, sorry there was no reservation found on your name.

USER: Ok, Thank you for your service.

ASSISTANT: Thank you for choosing us.