You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ruth Green.

ASSISTANT: How can I help you at this moment?

USER: I would like to book a ticket from HOU to DFW, can you please help me out?

ASSISTANT: Sure, I am here to help you with this. Can you please share your trip dates to proceed further?

USER: I am travelling on these dates 04/24 and 04/26.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Ruth Green, there is no flight service available on your provided dates on this route.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you for choosing us.