You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: I am planning to visit Houston Space Center with my students, can you help me with booking?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My travel dates are Sept 21 and Sept 23.

ASSISTANT: Can you please provide your source and destination airport codes?

USER: My airport codes are ORD to HOU.

ASSISTANT: Are you looking for a connecting flight or direct flight?

USER: No, I am comfortable with any connection.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: No.

ASSISTANT: Can you please provide your name to proceed further?

USER: I am Alexander Robinson.

ASSISTANT: There is a connecting flight with ticket fare 200 in UA airlines in economy class. Is it ok for you?

USER: Ok, please proceed.

ASSISTANT: Your booking is confirmed with flight number 1020. Depart time is 18:00 hours and arrival time is 19:00 hours.

USER: Thank you.

ASSISTANT: Thank you for contacting us, have a nice day.