You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Frank Hall.

ASSISTANT: Frank Hall, how may I assist you with today?

USER: Help me in booking my flight ticket from HOU to JFK.

ASSISTANT: May I know your preferences in your journey please?

USER: My journey dates will be July 04, my return date will be July 06.

ASSISTANT: I am sorry to say that there are no flight available on those dates.

USER: Its ok, thank you.

ASSISTANT: Thank you for reaching us. Have a great day.