You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Can you please book a flight ticket from CLT to IAD?

ASSISTANT: Sure, provide me your travelling dates.

USER: Thank you. I have planned my travel dates as Aug 14 and Aug 16.

ASSISTANT: Ok, do you have any class preference?

USER: No, I am ok  with any class.

ASSISTANT: May I know your name please?

USER: Sure, myself Joseph Miller.

ASSISTANT: Do you prefer any airlines?

USER: No but I would like to return in morning time so please make sure that.

ASSISTANT: Sure, do you required any connection flight?

USER: I am looking for single connecting flight so please make sure that.

ASSISTANT: Ok.

USER: That's ok.

ASSISTANT: Based on your specifications we do not found any flight in airline database.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.