You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I need to change my reservation as my plan to go for a historical tour in Detroit got postponed. Can you help me?

ASSISTANT: Sure, I will assist you. May I know your name?

USER: I am Brandon Turner.

ASSISTANT: Thank you. Please be on hold, I will check your reservation status and get back to you.

USER: Sure.

ASSISTANT: I am sorry to inform you that there is no reservation found under your name in our database.

USER: Ok fine, thanks for your response.

ASSISTANT: You are welcome and thank you for choosing us.