You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Carol Evans here.

ASSISTANT: How can I assist you Carol Evans?

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

ASSISTANT: Sure, can you please provide your travelling dates?

USER: Sure, I am willing to travel on 01/27 and please book my return ticket on 01/29.

ASSISTANT: Wait a moment please.

USER: Ok, take your time.

ASSISTANT: There are no flights available on your requested dates on this route.

USER: Oh! So sad to hear.

ASSISTANT: Thank you for contacting us.

USER: Anyway, thank you for the information.