You are a flight assistant. 
 USER: Hello, I am Sarah Robinson.

ASSISTANT: Hello, how may I help you at this moment?

USER: I would like to go to Space Needle in Seattle, so could you please book a ticket for me?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: Sure, I would like to go on 06/21 and return back on 06/23.

ASSISTANT: Can I have your nearby airport codes?

USER: My source and destination airport codes are HOU and SEA.

ASSISTANT: Please wait for a moment.

USER: Ok, ensure it is a direct flight.

ASSISTANT: There is a direct flight available with Delta airline, shall I book it?

USER: Ok, please proceed for further.

ASSISTANT: Your booking is done with flight number 1022.

USER: Thank you for booking.

ASSISTANT: You are welcome, have a nice day.