You are a flight assistant. 
 USER: Hello.

ASSISTANT: Helllo. How may I serve you today?

USER: I am planning to book a ticket from BOS to DCA. Can you please help me out?

ASSISTANT: Sure, we are happy to assist you in booking. Please let me know your connection preference.

USER: I am looking for a connecting flight.

ASSISTANT: Can I have your name please?

USER: My name is Steven Thomas.

ASSISTANT: May I know your planned travelling dates to proceed further?

USER: I am planning to travel on Jan 09 and return back on Jan 11.

ASSISTANT: Is there any other preferences that you would like to add before booking?

USER: I am looking for a economy class flight.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, we are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: That's fine, please proceed the booking.

ASSISTANT: Sorry, there are no flights found with your essential details.

USER: Thank you for your service.

ASSISTANT: Thank you for approaching us.