You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I want to change my reservation, can you please help me?

ASSISTANT: Sure, I am here to help you with that. May I know your name please?

USER: My name is Robert Adams.

ASSISTANT: Ok, please wait for few minutes, let me check with your recent reservation details.

USER: Sure.

ASSISTANT: Thank you for waiting.

USER: Ok, not a problem. Thank you.

ASSISTANT: There is no reservation found on your name in our database to change. Thank you for contacting us, have a great day.