You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Samantha Lee. I want to book a ticket from IAH to PHL to attend seminar, can you help me in booking?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: I am departing on July 28 and return on July 30.

ASSISTANT: Do you have any particular time for departing and returning?

USER: I want to return in evening time.

ASSISTANT: Would you like to prefer direct flight or connecting flight?

USER: I want a flight with single connection limit.

ASSISTANT: Sorry, there is no flight available in this route.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for approaching us.