You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I want to travel from LAX to IAH. Can you help me to book a flight ticket?

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

USER: I want to fly in the flight on Dec 19 and Dec 21.

ASSISTANT: Thank you, do you have any class reference on your trip?

USER: I want to travel in business class.

ASSISTANT: Sure, may I know your name for the booking process?

USER: Ryan Turner.

ASSISTANT: Do you have any another specifications on your journey?

USER: I want to have a connection of 1.

ASSISTANT: Unfortunately, no flights available on your requirements.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Welcome, thank you for reaching us.