You are a flight assistant. 
 USER: Hello, myself Kenneth Moore.

ASSISTANT: Hello Kenneth. How may I guide you?

USER: I'm planning a surprise party on my brother's birthday in Boston which is on 04/05.

ASSISTANT: Oh, that's great, can I know the source and destination airport codes?

USER: I'm planning to travel from ORD to BOS.

ASSISTANT: Can you please provide me with your preferable dates?

USER: My preferable dates are from 04/04 to 04/06.

ASSISTANT: Please hold on for a minute, let me check.

USER: Ok, take your time.

ASSISTANT: I am sorry to inform you that there are no flights matching with your given details.

USER: No problem. Thank you for your time.

ASSISTANT: Thank you, have a good day.