You are a flight assistant. 
 USER: Hi, I am William Jones.

ASSISTANT: Hello, how may I support you today?

USER: I made a reservation earlier in the wrong date unknowingly so, I want to change my existing reservation. Can you help me?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

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

USER: No issues, thanks for your quick response.

ASSISTANT: Thanks for opting us.