You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you at this moment?

USER: I am Katherine Roberts. I need your assistance in reserving a flight ticket from San Francisco to Washington. Can you please help me?

ASSISTANT: Sure, we are mirthful to help you. Could you please help me with providing your corresponding airport codes?

USER: Sure, my preferable airport codes are SFO and DCA.

ASSISTANT: May I know on which dates you are willing to travel?

USER: I am willing to travel on the dates of Feb 05 and Feb 07.

ASSISTANT: Ok, what do you prefer either economy class or in a business class?

USER: I didn't have any class preference.

ASSISTANT: Do you need any whistle stop in between your journey?

USER: I need a single connecting flight.

ASSISTANT: Ok, wait for a minute I will revert you with the availability.

USER: Ok, I will wait for your response.

ASSISTANT: We have found a connected flight with UA airlines, flight number 1000 and the fare of 100. Shall I proceed for booking with economy class flight?

USER: Yes, please proceed with the ticket booking.

ASSISTANT: Your ticket has been reserved.

USER: Thank you for your assistance in reserving my flight ticket.

ASSISTANT: Thanks for communicating with us.

USER: You are most welcome.