You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you at this moment?

USER: I am Samantha Thompson. Can you help me in booking my flight ticket from Apr 12 to Apr 14?

ASSISTANT: Sure, I am happy to help you with the ticket booking. Could you please provide me your travel airport codes?

USER: Please check the availability of flights from IAD to ORD?

ASSISTANT: Ok, do you have any class preference?

USER: Yes, I prefer a connecting flight with a fare of 5000.

ASSISTANT: Ok, which airlines do you prefer?

USER: As the delta airline gives the best service, please check the availability of seat in Delta.

ASSISTANT: There is no flight available in the Delta airlines but UA airline is providing the service in this route. Are you fine with the UA airlines to travel?

USER: Ok, as it is a urgent please go ahead with booking.

ASSISTANT: Ok, the flight ticket is reserved for you and the flight number is 1014 which is a economy class flight. Have a nice journey.

USER: Thank you for your quick response.

ASSISTANT: You are most welcome. Thank you for choosing our agency to reserve your flight ticket.