You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you at present?

USER: I want to attend for a CBI secret meeting which is going to be held at Washington to know about new techniques and ideas to reduce the crimes. Can you please book a ticket on 12/25?

ASSISTANT: Sure, we are ecstatic to help you for booking.

USER: Thank you.

ASSISTANT: May I know, when do you want to return from Washington?

USER: I would like to return on 12/27.

ASSISTANT: Could you please share your boarding point?

USER: Sure, My nearest boarding airport is Los Angeles, CA - LAX.

ASSISTANT: Ok, please provide the name on which you want to book a flight ticket.

USER: Sure, please book a ticket on the name of Rebecca Johnson.

ASSISTANT: Ok, Please specify the Washington airport code.

USER: Washington airport code is DC - DCA.

ASSISTANT: To proceed further, kindly mention your budget.

USER: I can spend up to 500.

ASSISTANT: Thanks for your information, please be on hold.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for being patient, there is a flight found in UA airline with a fare of 100 which matches to your details. Are you comfortable with UA airline?

USER: Yes, I am comfortable with UA airline, please proceed for booking.

ASSISTANT: Sure. Your E-ticket has been generated and it will sent to your registered Email- id.

USER: Thank you for your service.

ASSISTANT: Thank you for approaching our service. Have a nice day. And the flight number is 1001.

USER: Ok, Thank you.