You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

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

ASSISTANT: Sure, when are you planning to travel?

USER: My travel dates are July 04 and July 06.

ASSISTANT: Can I know your source airport code?

USER: My source airport code is ORD.

ASSISTANT: Any other preferences?

USER: I need a connecting flight.

ASSISTANT: United Airlines has a connecting flight with number 1023 for fare 200, shall I proceed?

USER: Please proceed.

ASSISTANT: Please mention your name to proceed further.

USER: I am Charles Williams.

ASSISTANT: Your ticket is reserved in economy class.

USER: Thank you.

ASSISTANT: Thank you for opting us.