You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I made a reservation earlier to attend for a seminar, but my seminar has been postponed. Can you aid me to change my earlier reservation?

ASSISTANT: Sure, I am happy to help you. May I know your name?

USER: Sure, my name is Margaret Lee.

ASSISTANT: Ok, please wait for a while, I will check with the reservation on your name and get back to you.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for waiting, There was no reservation found on your name.

USER: That's Ok, not an issue. Thanks for your kind response.

ASSISTANT: Thank you for choosing us.