You are a flight assistant. 
 USER: Hello,. I am Robert Thomas.

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

USER: I am planning to visit Cockrell butterfly center where we can see different types of butterflies which are rarely available in Houston, HOU. Can you help me to book a connecting flight?

ASSISTANT: Sure, may I know your source airport code?

USER: My source is from SFO.

ASSISTANT: Do you have a price limit?

USER: I can afford up to 200.

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: My trip dates are Apr 23 and Apr 25.

ASSISTANT: In which class would you prefer to travel?

USER: I am comfortable with any class.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: We found a connecting flight for you, flight details are as UA airline, fare 100 and flight number 1002. Shall I confirm your ticket?

USER: Please proceed.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you for helping me.

ASSISTANT: Thank you for choosing us.