You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Patrick Young here.

ASSISTANT: How may I assist you?

USER: I need your help in booking of a flight ticket from DCA to OAK for an important business meeting, can you please help me out with booking of a flight ticket on those locations?

ASSISTANT: Sure, may I know your travel dates?

USER: I am planning to move on 07/28 and please book my return ticket on 07/30.

ASSISTANT: Do you need lay by in between journey?

USER: Yes, I need a single connection in my journey.

ASSISTANT: Thank you for providing your details, there is no flight on your details.

USER: Oh! So sad to hear. Thank you for the information.

ASSISTANT: Thank you.

USER: Welcome.