You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Brandon Collins.

ASSISTANT: How may I help you today?

USER: I had planned to go on a trip, but it was postponed. Can you change my recent reservation?

ASSISTANT: I will help you with that, please wait for a minute.

USER: Sure.

ASSISTANT: I am sorry to say that there is no reservation found.

USER: That's ok.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your help.