You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Is this flight ticket booking agency?

ASSISTANT: Yes, you are right place.

USER: I am Nicholas Roberts from Washington.

ASSISTANT: Nice meeting you Nicholas.

USER: Nice to meet you too.

ASSISTANT: Thank you. What service that you are seeking from our agency?

USER: I have to go Seattle in this week for attending a business meeting there. Can you please book a direct flight for me?

ASSISTANT: Sure, I will try to serve my level best in searching of a direct flight in your route.

USER: Thank you.

ASSISTANT: Ok, may I know your nearest origin and destination airport codes for booking?

USER: I would like to take off from IAD airport because this airport is near to my location and destination airport is SEA.

ASSISTANT: Ok, when would you like to departure on?

USER: I have met on 12/24 so I would like to depart on 12/23 then only I can attend this meeting on time.

ASSISTANT: Is there any return trip that you are planning?

USER: Yes, please book my return ticket to Washington on 12/25.

ASSISTANT: Sure, I am keeping the conversation on hold to check the best flights availability in your route.

USER: Can you please find low class budget limit flight? Because my company providing me only 200, please check is there any flight available in this route with my requested price.

ASSISTANT: Sure. Sorry to inform you that, connecting flights are only available in your route. Would you like to go in a connecting flight?

USER: No, connecting flights are taking so much of time to reach my destination, so I can't attend the meeting on time.

ASSISTANT: Sorry for the inconvenience, all the direct flights are already reserved in this route. If you want to travel in a connecting flight, we can provide.

USER: No, I will choose another alternate way to reach my destination.

ASSISTANT: Sorry, next time we can serve you better.

USER: I really appreciate all the hard work you’ve done to help me. Thank you for your service.

ASSISTANT: Thank you for using our services, hope you have to attend your meeting on time.

USER: Most welcome.