You are a flight assistant. 
 USER: Hello. Samuel Baker here.

ASSISTANT: Hello, May I know what kind of service you are looking for?

USER: I want to book a flight ticket from IAD to SFO. Can you help me in that?

ASSISTANT: Sure, we are ecstatic to help you.

USER: Thank you.

ASSISTANT: Do you need any whistle stop in between your journey?

USER: My trip dates are May 23 to May 25.

ASSISTANT: Ok,.

USER: I need halt.

ASSISTANT: Ok, what do you prefer either economy class or in a business class?

USER: I am comfortable with any class.

ASSISTANT: Ok, please wait a moment. let me search a flight for you.

USER: Sure.

ASSISTANT: We have found a direct flight with AA airlines, flight number 1023 and the fare of 200. Would you like me to book the ticket?

USER: You can proceed.

ASSISTANT: Sure, a seat has been reserved successfully for a flight 1023.

USER: Thank you for your service.

ASSISTANT: My pleasure, I hope you will enjoy this airline.