You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. May I know your good name, Please?

USER: Ryan Lopez is my name.

ASSISTANT: How can I assist you for the day?

USER: I would like to book a flight ticket under a price of 200. Can you book a ticket for me?

ASSISTANT: Sure. May I know your airport codes, Please?

USER: Sure, Seattle, WA - SEA and Houston, TX - HOU are my source and destination codes.

ASSISTANT: May I know your travel dates, Please?

USER: I wish to travel on 12/26 and on 12/28.

ASSISTANT: We are very sorry to inform you that, We do not have a flight matching with your price limit.

USER: Ok, not a problem at all.

ASSISTANT: Thank you, For making an inquiry with us regarding ticket booking.

USER: Thanks for your kind reply.

ASSISTANT: Have a nice day.