You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be at your service?

USER: I am planning to meet my cousin in Austin, could you please help me in booking a flight ticket from San Francisco?

ASSISTANT: Sure, please mention your airport codes.

USER: My airport codes are CA - SFO, TX - AUS.

ASSISTANT: When do you prefer to travel?

USER: I want to fly on 05/22 and return on 05/24.

ASSISTANT: May I know your name?

USER: I am Charles Brown.

ASSISTANT: UA airline with flight number 1007 and fare of 100 is available for you. Shall I proceed?

USER: You can proceed to booking.

ASSISTANT: Your booking has been done.

USER: Thank you for your help.

ASSISTANT: Thank you for choosing us.