You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Being a cardiologist, I need to attend a surgery. I would like to book a ticket. Please help me out.

ASSISTANT: Sure, I can help you. Can you please share your travelling dates?

USER: My travelling dates are from 01/13 to 01/15.

ASSISTANT: Ok, please tell me your source and destination codes.

USER: My source and destination airport codes are DCA and IAD.

ASSISTANT: Ok. According to your information, there is a plane with flight number 1005 having price as 100.

USER: Ok, please book my ticket.

ASSISTANT: Ok, your plane ticket is confirmed.

USER: Thank you for your help.

ASSISTANT: May I know your name please?

USER: My name is John Smith.

ASSISTANT: Smith, thank you for approaching us.

USER: You are welcome.