You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Please book me a flight ticket from PHL to IAH to meet my family.

ASSISTANT: Sure, can I know the travel dates please?

USER: I have planned to travel on Oct 18th and return on Oct 20th.

ASSISTANT: May I know your name please?

USER: Katherine Martin.

ASSISTANT: Do you have any requirements?

USER: I prefer connecting flight.

ASSISTANT: Sorry, there are no flights available as per your request.

USER: Ok, no problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you.