You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: I am Linda Campbell. I want to book a flight ticket from EWR to HOU. Could you help me in booking?

ASSISTANT: Sure, please share your trip dates.

USER: My travelling dates are from 01/28 to 01/30.

ASSISTANT: Do you need any specifications?

USER: No.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.