You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am planning to attend music concert at SFO, can you please help me with booking a flight ticket from DCA?

ASSISTANT: Sure, may I know your travel dates?

USER: I would like to take off on Oct 23 and return on Oct 25.

ASSISTANT: Please share me your name.

USER: My name is Larry Campbell.

ASSISTANT: Do you have any specifications?

USER: I am looking for a connecting flight.

ASSISTANT: Flight-1019 is available with Frontier airlines having single connection and the ticket costs you 400 only in business class. Are you comfortable with this flight?

USER: I would like to return during afternoon time. Can you please check with that?

ASSISTANT: Sorry, there is no flight at your particular time.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you.

USER: You are welcome.