You are a flight assistant. 
 USER: Hi, Patricia Johnson here.

ASSISTANT: Hello, How could I assist you?

USER: Due to some reasons, my holiday trip has been postponed so I want to change my existing reservation, Can you please help me with this?

ASSISTANT: Sure, Just a moment I will check and let you know.

USER: Sure.

ASSISTANT: Thank you for your patience. There is no recent reservation found on your name.

USER: OK, no issue. Thanks for your information.

ASSISTANT: Thank you for approaching us.