You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assistance provide to you?

USER: I need to change my current reservation due to urgent meeting, can you help me with that?

ASSISTANT: May I know your good name please?

USER: Sure, my name is Anthony Campbell.

ASSISTANT: Just give me a moment.

USER: Sure, take your time.

ASSISTANT: There is no active reservation found with your provided name.

USER: Oh! I think the ticket was not booked due to server issue. Anyway, thank you for the information.

ASSISTANT: Thank you for choosing us.

USER: Welcome.