You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How best can I assist you now?

USER: Please help me in booking a flight ticket to IAH from PHL in April month.

ASSISTANT: Sure, I am glad to help you with that. May I know your travelling dates, please?

USER: Sure, my travelling dates are Apr 11 and Apr 13.

ASSISTANT: Do you have any connection limit for your flight?

USER: I need single connecting flight for your journey.

ASSISTANT: May I know about your other specifications, if any?

USER: No.

ASSISTANT: Can you please share me your good name to proceed further?

USER: I am William Hill.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: We regret to say that, we have not found any flights running on your desired routes.

USER: Not a problem, anyways thank you for the information.

ASSISTANT: Thanks for choosing us.

USER: You are welcome.