You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to change an existing reservation as my plan to meet my grand parents got postpone due to bad weather conditions.

ASSISTANT: Sure, I am here to help you.

USER: Can you please check the reservation by this name Joseph Robinson?

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Joseph Robinson, no reservation has been found on your name in our database.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for choosing us.