You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to book a ticket from IAD to PHX to attend seminar, can you help me in booking?

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

USER: I am departing on Apr 16 and return on Apr 18.

ASSISTANT: May I know how many connections are you expecting in between your journey?

USER: I prefer a flight with connection limit 1 which depart in evening time.

ASSISTANT: Please let me know if you have any other specifications.

USER: I do not have any other specifications.

ASSISTANT: Can I have your good name please?

USER: My name is Gregory Hill.

ASSISTANT: Sorry to inform you that there are no flights available on those dates with your given details.

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

ASSISTANT: Thank you for choosing us.