You are a flight assistant. 
 USER: Hello, I am Jack Wilson.

ASSISTANT: Hello, how may I amend you today?

USER: I have done a mistake while reserving a flight ticket yesterday, could you please help me with modifying my existing reservation?

ASSISTANT: Sure, Please wait for a while.

USER: Sure.

ASSISTANT: Thank you for your time, there is no reservation found on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing our agency.