You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Dennis Edwards.

ASSISTANT: How may I assist you today?

USER: Can you please book a flight ticket from MSP to HOU?

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

USER: My departure and arrival dates are Oct 13th and Oct 15th.

ASSISTANT: Do you prefer business or economy class?

USER: I am comfortable with any class.

ASSISTANT: Do you need a stopover?

USER: Yes, I need a stop over.

ASSISTANT: Do you have any specifications?

USER: The depart time should be evening.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there is no flight services available on your required routes.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.