You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to book a flight ticket from IAH to PHL. Could you help me in booking?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: My travelling dates are from Feb 18 - 20.

ASSISTANT: Can you please share your name please?

USER: Dorothy Thomas.

ASSISTANT: Is there any connection limit?

USER: I prefer for connecting flight.

ASSISTANT: Do you have any other specification?

USER: My return time should be in the evening.

ASSISTANT: Dorothy Thomas, there are no flights available in your route.

USER: That's ok, no problem.

ASSISTANT: Thank you for choosing us.