You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I would like to book a flight ticket to Chicago to take a part in scuba driving, could you please help me to book a flight ticket with single connection?

ASSISTANT: Sure, We are here to help you. Can I know your airport codes.

USER: My boarding and landing airport codes are ATL and ORD.

ASSISTANT: Please share me your travelling dates.

USER: I would like to depart on Mar 25th and my return date will be on Mar 27th.

ASSISTANT: Is there any other specifications?

USER: I want to depart in the evening.

ASSISTANT: May I know your name?

USER: I am Barbara Smith.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: Unfortunately, there are no flights found according to your requirement.

USER: That's ok, I'll choose any alternative to reach my destination. Thank you.

ASSISTANT: Thank you for reaching us.