You are a flight assistant. 
 USER: Hello,. I am Larry Collins.

ASSISTANT: Hello, how can I support you today?

USER: I need to change my existing reservation as my meeting with share holder has been postponed. Will you help me out?

ASSISTANT: Sure, please give me a minute.

USER: Sure.

ASSISTANT: Thanks for your patience, no reservation was found on your name in our database.

USER: Ok, I think I have done reservation with other airline.

ASSISTANT: Thank you for availing us.

USER: Thank you for the effort.