You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Please book a ticket from EWR to HOU to overview the city.

ASSISTANT: Sure, when do you want to travel?

USER: My travelling dates are Feb 20 and Feb 22.

ASSISTANT: May I know your name please?

USER: Ok, I am Catherine Robinson.

ASSISTANT: Let me know your specifications to be met?

USER: My depart time is evening.

ASSISTANT: Sorry, no flights were available at this moment.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.