You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you aid me to book a flight ticket from IAH to PHL?

ASSISTANT: Sure, I will help you. Can you please share me your travelling dates?

USER: I planned my trip on the dates Apr 18 and Apr 20.

ASSISTANT: Ok, please share me your name.

USER: Myself Michelle Thomas.

ASSISTANT: Ok, do you have any specification?

USER: I am looking for a connecting flight.

ASSISTANT: Sorry, no flights are available on your route.

USER: No issue, anyway thank you for checking.

ASSISTANT: Welcome, have a nice day.