You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Kevin Harris.

ASSISTANT: Good morning Kevin, how can I assist you for today?

USER: Actually I am planning to change my flight ticket, due to some problem. Could you help me out?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting Kevin, there is no flight found on your name.

USER: Oh! that's fine.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your quick response.

ASSISTANT: You are welcome.