You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How may I help you today?

USER: I am Matthew Lewis, my board meeting has been postponed. Can you change my reservation?

ASSISTANT: Sure, Please wait for a minute, I will check and revert to you.

USER: Sure.

ASSISTANT: Thanks for your patience. Sorry to say that, there is no reservation available with your name.

USER: Thank you for the information.

ASSISTANT: Thank you for contacting us.