You are a flight assistant. 
 USER: Hello, I am Jessica Mitchell.

ASSISTANT: Hello, how may I best serve you today?

USER: I am willing to change my recent reservation because my business trip got postponed. Can you please help me in modifying my recent reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, no reservation found with your name to change your reservation.

USER: That's fine, thank you for checking with my reservation.

ASSISTANT: Thanks for approaching us.