You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Sandra Miller. I would like to travel from DEN to meet my friend who was staying in HOU, can you help me to make a flight reservation?

ASSISTANT: Sure, I can help you. May I know your travel dates?

USER: Thank you, my travelling dates are 01/05 and return back to my city on 01/07.

ASSISTANT: Do you prefer economy or business class?

USER: With any class you can proceed.

ASSISTANT: Sorry there is no flight on your details.

USER: That. That's fine, thanks for your information.

ASSISTANT: Thank you for choosing us.