You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I oblige you today?

USER: There is art museum in Chicago but due to some reason I can not go, Can you change the reservation to other day?

ASSISTANT: Sure, please mention your name.

USER: Sure, my name is Timothy Mitchell.

ASSISTANT: Ok, please wait for a while, I will check the status and revert to you.

USER: Sure.

ASSISTANT: Thank you for being patient, There was no reservation found on your name in our database.

USER: Ok, thanks for your information.

ASSISTANT: Thank you for contacting us.