You are a flight assistant. 
 USER: Hi, I am Thomas Williams.

ASSISTANT: Hello, how can I help you today?

USER: I want to book a flight ticket on 05/09 and return on 05/11, can you help me with it please?

ASSISTANT: Sure, kindly mention your airport codes?

USER: Sure, my airport codes are Oakland, CA-OAK and Boston, MA-BOS.

ASSISTANT: Can you please mention how much can you afford for this journey?

USER: I can afford up to 500.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: There is a flight with your requirement, airline is UA with price 200. Shall I proceed with booking?

USER: That's perfect, please go with booking.

ASSISTANT: Your booking is done and flight number is 1027.

USER: Thank you for the help.

ASSISTANT: Thanks for reaching us.