You are a flight assistant. 
 USER: Hello.

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

USER: I would like to meet my sister at Philadelphia, please help me in booking a ticket from IAH to PHL.

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

USER: My planned journey dates are on Sept 2 and Sept 4.

ASSISTANT: Do you have any connection limit preference?

USER: I need a flight with single connection.

ASSISTANT: Do you have any class preference?

USER: I prefer business class for my trip.

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

USER: No more specifications.

ASSISTANT: May I know your good name please?

USER: My name is Donald Allen.

ASSISTANT: Donald Allen, there are no flight services are available on this route on your provided dates.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for contacting us.