You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I need you to book a flight ticket from ORD to SFO, please help me.

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: September 14 and 16, are my planned travelling dates.

ASSISTANT: Can I know your name please?

USER: Donald Thompson here.

ASSISTANT: Do you need any specifications?

USER: I wish to return in the morning flight.

ASSISTANT: Sorry, there are no flights found.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.