You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I please know your name?

USER: I am Gregory Evans.

ASSISTANT: Do you want me to help you with anything?

USER: I am a sports player, I have to attend this match in Chicago  can you please book a flight?

ASSISTANT: Could you provide your travelling dates?

USER: My travelling dates are 12/17 to 12/19.

ASSISTANT: May I know your airport codes?

USER: My origin airport code is BOS and destination airport code is ORD.

ASSISTANT: Give me a minute?

USER: Ok.

ASSISTANT: Sorry to say that there is no flight found.

USER: It's ok. Thank you for your information.

ASSISTANT: Thank you for contacting us.