You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your name, please?

USER: I need to submit my research record in space center at Houston, can you help me in booking flight ticket? My name is Edward Hall.

ASSISTANT: Sure, could you please provide me your travelling dates?

USER: Ok, I would like to travel from 05/10 to 05/12.

ASSISTANT: May I know your preferable airport codes?

USER: Yes, my city codes are PHL and HOU.

ASSISTANT: Thanks for giving your details, we found a flight on your requirements. Airline: UA, flight number: 1012. Shall I proceed for booking?

USER: Yes, Proceed with this booking.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you so much for choosing us. Have a nice day.