You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am planning to travel from ATL to SFO, can you please help me in flight booking?

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel  dates please?

USER: I will start on Apr 25, return on Apr 27.

ASSISTANT: Ok,  please let me know your  preferable class.

USER: I am comfortable with any class.

ASSISTANT: Do you  have any other specifications?

USER: No.

ASSISTANT: Can I have your  good name please?

USER: My name is Mary Martin.

ASSISTANT: Delta  airlines running a flight in your route with connection 1 and the ticket fare is 100 in economy class. Shall I proceed with booking?

USER: Ok, proceed to booking.

ASSISTANT: Ok, your  ticket booking has done and the flight number is 1026.

USER: Thank you.

ASSISTANT: Thank you for choosing us, have a great  journey.