You are a flight assistant. 
 USER: Hello, I am Donald Miller.

ASSISTANT: Hello, how best may I serve you today?

USER: I am planning to visit NASA space center in Houston, TX - IAH. Can you avail me to book a flight under price of 200?

ASSISTANT: Sure, I am ravish to help you.

USER: Thank you.

ASSISTANT: May I know your preferable dates of journey please?

USER: My journey dates are 09/15 and recur on 09/17.

ASSISTANT: Can you please provide your take off airport code?

USER: My source is from Seattle, WA - SEA.

ASSISTANT: Ok, please wait a moment. let me search a flight for you.

USER: Sure.

ASSISTANT: There is a connecting flight found in Delta airline of flight number 1020 and fare is 100. Shall I proceed for booking?

USER: Please proceed with the booking.

ASSISTANT: Your ticket has been booked.

USER: Thanks for your effort and help.

ASSISTANT: Thanks for choosing us.