You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Paul Moore.

ASSISTANT: How may I aid you?

USER: I want to travel from EWR to HOU. Can you book a flight ticket for me?

ASSISTANT: Sure, please mention your travelling dates.

USER: I want to fly in the flight on 04/21 and 04/23.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry Paul, there are no flights available on your route.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for choosing our service.