You are a flight assistant. 
 USER: Hello. I am Patrick Parker.

ASSISTANT: Hello, how may I help you today?

USER: I am looking for a flight from IAH to EWR, can you help me out in booking flight ticket?

ASSISTANT: Sure, I am here to help you in booking flight. Can you please help me with your travel dates?

USER: My trip dates are from Jul 25th till Jul 27th.

ASSISTANT: Please wait a moment.

USER: I need my return flight in morning.

ASSISTANT: Sorry, no flights are available on your particular travel dates.

USER: That's ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us, have a safe flight.