You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I have planned a trip to DCA to attend a meeting, can you please book a flight ticket booking from EWR location?

ASSISTANT: Sure, may I know your trip dates?

USER: Thank you and my planned dates are May 16 and I will arrive back on May 18.

ASSISTANT: Which class do you prefer to travel?

USER: I need an economy class flight.

ASSISTANT: Can I know your connection limit?

USER: I need a single connection flight.

ASSISTANT: May I know your full name?

USER: My name is Eric King.

ASSISTANT: There is a flight of United airline, flight number 1021 with the fare of 200.

USER: I would like to depart in the morning time, check with this.

ASSISTANT: Ok, wait a minute. Let me check the flight availability.

USER: Sure.

ASSISTANT: Sorry, there are no flights available on your request.

USER: Not a problem with that one, thank you for your help.

ASSISTANT: Thank you for choosing us.