You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you please book a flight ticket from OAK to DCA?

ASSISTANT: Sure, I am here to help you. Can I know your travel dates please?

USER: Thank you. I have planned my travel dates as June 12 and June 14.

ASSISTANT: Ok, please tell me your connection limit preference.

USER: I am looking for single connecting flight so please check with that.

ASSISTANT: Ok, please tell me your name.

USER: Sure, myself Michael Jackson.

ASSISTANT: Sorry to inform you that, there are no flights available in this route on the dates you have given.

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

ASSISTANT: You are welcome. Thank you for reaching us.

USER: Most welcome.