You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you?

USER: I am John Anderson from Orlando. I want to change my travel dates in my previous reservation so can you please help me with that?

ASSISTANT: Sure, let me check the data base and revert you.

USER: Ok, thank you.

ASSISTANT: We could not find any reservation by the name you provided.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: Thank you for picking us.