You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Patrick Williams here.

ASSISTANT: How can I help you?

USER: My wedding has been postponed, so I want to reschedule my itinerary dates.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: I am sorry no reservation found on your name.

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us.