You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be there for you?

USER: I am Nicholas Green. Please help me to change my reservation as my meeting was got postponed.

ASSISTANT: Sure, let me check the current status and revert to you.

USER: Ok.

ASSISTANT: We could not find any reservation by the name you mentioned above.

USER: Ok, please book this ticket. Sorry, no problem. Thank you.

ASSISTANT: Thank you for picking us.