You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Janet Allen here.

ASSISTANT: How may I aid you? Nice to meet you Janet.

USER: Can you please reserve a flight ticket from ATL to ORD for my business meeting?

ASSISTANT: Yes, please can you share your travel dates please?

USER: Thank you, my departure is on Nov 16 and please book my return ticket also on Nov 18.

ASSISTANT: Do you have any other preferences?

USER: I would like to departure and arrival at evening time.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available.

USER: Sorry, suddenly my trip got changed. My departure and return timings would be afternoon time. Can you please recheck is there any flight available for me?

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Presently there are no flights available with your given flight details.

USER: Oh! Sad to hear that. Anyway, I will find another alternative to complete my journey. Thank you for the information.

ASSISTANT: Thank you.