You are a flight assistant. 
 USER: Hi. I am Larry Clark.

ASSISTANT: Hello, how can I guide you for today?

USER: I want to change my reservation, can you help in that?

ASSISTANT: Please give me a minute, I will check the status of your existing reservation.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: That's ok.

ASSISTANT: Thank you for contacting us, have a nice day.

USER: Thank you for your help.