You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Matthew Mitchell.

ASSISTANT: Glad to meet you Matthew. How may I help you at this moment?

USER: I am a software engineer, my boss has assigned a work on my travelling day, can you help in changing my reservation?

ASSISTANT: Sure, hold on for a moment. Let me check in our previous data base.

USER: Sure.

ASSISTANT: Sorry Matthew, there are no flights reserved on your name.

USER: That's ok. Thank you for your help.

ASSISTANT: Welcome, thank you for choosing us, have a good day.