You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today?

USER: As I am planning to give a surprise party for my parents at LAS, help me in booking my flight ticket from DCA.

ASSISTANT: Sure, may I know your good name?

USER: I am Kenneth Thompson.

ASSISTANT: Could you please share your preferred dates of journey?

USER: My trip dates will be May 19th, I would like to return on May 21st.

ASSISTANT: Do you prefer a connecting or direct flight?

USER: I prefer to travel in a connecting flight.

ASSISTANT: Please let me know your airline preference?

USER: I am fine with any type of airline.

ASSISTANT: Do you have any other specifications?

USER: No, as an urgent please go with the above details.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry, there are no flights available as per your requirements.

USER: Its ok, thank you.

ASSISTANT: Thank you for opting us.