You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in flight ticket booking process from IAH to EWR?

ASSISTANT: Sure, can I know your trip dates?

USER: Thank you for your response, I want to take off on June 30 and book my return ticket also on July 02.

ASSISTANT: Do you need a stopover in between journey?

USER: I will prefer 1 break in between my journey.

ASSISTANT: Do you have any other preferences?

USER: I want to take off in evening time.

ASSISTANT: May I know your name?

USER: Sure, my name is Mark Walker.

ASSISTANT: Sorry, there are no flights available on your travelling dates.

USER: Oh! It's ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.