You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you now?

USER: I am Gregory Green. I want to book a ticket from IAH to CLT, can you help me?

ASSISTANT: Sure, may I know your travel dates please?

USER: My travel dates are Nov 18 and 20.

ASSISTANT: Let me know about your connection limit please.

USER: I need a connecting flight.

ASSISTANT: Do you have any class preference?

USER: I want to return in the morning.

ASSISTANT: May I know about your airline preference?

USER: I am comfortable with any flight.

ASSISTANT: Ok, please be on hold.

USER: I want to travel in economy class.

ASSISTANT: Ok. Sorry, we have not found any flights running on your desired routes.

USER: No problem, thanks for checking.

ASSISTANT: Thanks for reaching us.