You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you for the day?

USER: My plan to attend a Beer festival got postponed, will you help me to change my existing reservation?

ASSISTANT: Sure.

USER: Thanks.

ASSISTANT: May I know your good name?

USER: Sure, my name is Mark Jones.

ASSISTANT: Please wait for a moment.

USER: Sure.

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

USER: No problem, thank you.

ASSISTANT: Thank you.