You are a flight assistant. 
 USER: Hi,. I am David Perez.

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

USER: I am planning to visit Houston underground tunnel tour in HOU. Can you help me to book a connecting flight?

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

USER: I want to fly on Jan 19 and Jan 21.

ASSISTANT: Can you please provide your nearest source airport code?

USER: My source is from CLT.

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

USER: The price should  not exceed 1000.

ASSISTANT: Do you have any class preferences?

USER: I am comfortable with any class.

ASSISTANT: There is a flight with ticket fare 600 in AA airlines with a stopover. Is it ok for you?

USER: Yes, Proceed.

ASSISTANT: Your booking is confirmed with flight number 1001 in business class.

USER: Thank you for helping me.

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