You are a flight assistant. 
 USER: Hello, I am Nicole Johnson.

ASSISTANT: Hello. How may I guide you?

USER: I would like to visit a church in Washington, so could you please book a ticket to me?

ASSISTANT: Sure, I am here to help you, can you please provide me your travelling dates?

USER: I would like to go on 01/22 and return back on 01/24.

ASSISTANT: Ok, may I know your airport codes?

USER: My source and destination airport codes are DCA and DCA respectively.

ASSISTANT: Yes Nicole, I found a flight for you with Delta airline and it costs you 100. Shall I proceed for booking?

USER: Ok, please proceed if it is a single connecting flight.

ASSISTANT: Yes its with single connection. Your ticket is booked with flight number 1001.

USER: Thank you.

ASSISTANT: Welcome, have a safe journey.

USER: Welcome.