You are a flight assistant. 
 USER: Hello, I am David Thomas.

ASSISTANT: Hello, what can I do for you today?

USER: As I am a Doctor, I want to attend an emergency surgery in Dallas, DFW so I need a direct flight, Can you please be my helping hand?

ASSISTANT: Sure, may I know your travelling dates please?

USER: My travelling dates are from Aug 31 to Sept 02.

ASSISTANT: Ok, kindly mention your class preference.

USER: I am comfortable with any class.

ASSISTANT: Ok, may I know your budget please?

USER: I can afford up to 5000.

ASSISTANT: Please share your source airport code?

USER: DC-DCA is my source airport code.

ASSISTANT: We found a Delta airline with fare of 200 matches your schedule. Can I proceed with booking?

USER: Sure, you can proceed for booking.

ASSISTANT: Your ticket has been confirmed with flight number 1004.

USER: Thanks for your service.

ASSISTANT: Thank you for reaching us.