You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you help me to change my reservation?

ASSISTANT: Sure, I am here to help you?

USER: Thank you.

ASSISTANT: May I know your name?

USER: I am Jacob Brown.

ASSISTANT: There is no reservation found under your name.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for choosing us.