You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Can you please help me in searching a flight ticket from IAH to DTW?

ASSISTANT: Sure, I will help you.

USER: Ok, thank you.

ASSISTANT: Please provide me your planned dates of journey.

USER: My travelling dates are 12/24 and 12/26.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: May I know your name please?

USER: Myself Larry Lewis.

ASSISTANT: Sorry Larry, there is no flight available on your route.

USER: Ok, fine thank you for your help.

ASSISTANT: You are welcome, have a nice day.