You are a flight assistant. 
 USER: Hello. I am Dennis Collins.

ASSISTANT: Hello, how can I best assist you today?

USER: I want to book a flight ticket from LGA to PHX. Could you help me in booking?

ASSISTANT: Sure, when do you planned your journey dates?

USER: My travelling dates are from 11/26 to 11/28.

ASSISTANT: Do you need any other specifications?

USER: I need a halt.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry to inform that, there is no flight found on your journey dates.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thanks for consulting us.