You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: Can you please help me in reserving my flight from PHL to reach HOU?

ASSISTANT: Sure, I am here to help you. Can you please provide your journey dates?

USER: Thank you for the response, my travelling dates are Sep 18th and Sep 20th.

ASSISTANT: Do you have any connection limit preference?

USER: I prefer a direct flight for my journey.

ASSISTANT: Do you have any other specifications for this trip?

USER: I don't have any more specifications.

ASSISTANT: May I know your name to proceed further?

USER: I am Jonathan Baker.

ASSISTANT: Jonathan Baker, we regret to inform you that there are no direct flight services available on this route on your provided dates.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for contacting us.