You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I need to attend a board meeting in Atlanta. Will you please book me a connecting flight to reach there?

ASSISTANT: Sure, I will help you. Can I have your source and destination airport codes please?

USER: My origin is DCA and destination is ATL.

ASSISTANT: May I know your planned journey dates please?

USER: I would start on Jan 5th and return on Jan 7th.

ASSISTANT: Please help me with your name.

USER: I am Jack Smith.

ASSISTANT: Do you have any class preference?

USER: I am fine with any class.

ASSISTANT: May I know your specific timings of your journey?

USER: I don't have any time restriction.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Jack smith, no flights has been found on your planned journey dates.

USER: That's Ok, thanks for your assistance.

ASSISTANT: Thank you for approaching us.