You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I help you?

USER: Owing to an emergency, I need to travel to Boston, MA - BOS, can you please help me in booking a flight ticket?

ASSISTANT: Ok, I will help you in booking a ticket, could you please help me with your travelling dates?

USER: Sure. I want to travel on 01/26, and need to catch return flight on 01/28.

ASSISTANT: Could you please help me with your source code?

USER: Source airport is from Philadelphia, PA - PHL.

ASSISTANT: There is a UA 1000 airline which matches your requirements. Shall I proceed with booking?

USER: May I know the flight details?

ASSISTANT: Price is of 100.

USER: It is perfect, you can proceed with the booking.

ASSISTANT: May I know your name?

USER: Please book a ticket with the name of Alexander Lewis.

ASSISTANT: Your booking has been confirmed.

USER: Thanks for your kind help.

ASSISTANT: Thank you for approaching us.