You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am planning to book a ticket from PHL to IAH. Can you please help me out to book a ticket for me?

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

USER: I would like to travel on Apr 01 and return back on Apr 03.

ASSISTANT: Can you please share your connection limit?

USER: I am looking for a connecting flight.

ASSISTANT: Do you have any other specification?

USER: My return time should be evening.

ASSISTANT: May I know your name please?

USER: My name is Jack Wilson.

ASSISTANT: Jack Wilson, there are no flights available in your route. Thank you for choosing us,.

USER: That's fine, thank you for your help.