You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Dennis Wright here. I would like to book a ticket to Houston on the occasion of my son's convocation.

ASSISTANT: May I know your itinerary dates?

USER: My itinerary dates are may 25 and May 27.

ASSISTANT: Please share your genesis and terminus airport codes.

USER: My genesis and terminus airport codes are IAH and PHL.

ASSISTANT: Please give me a moment to check for available flights.

USER: Sure.

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

USER: No issue, I will make another arrangement. Thank you for your service.

ASSISTANT: Thank you for choosing us.