You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you?

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

ASSISTANT: Sure, may I know your trip dates?

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

ASSISTANT: Which class do you prefer?

USER: No, but I am looking for a connecting flight.

ASSISTANT: May I know your name?

USER: Raymond Wilson.

ASSISTANT: Sorry Raymond Wilson, no flights are available on your route.

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

ASSISTANT: Thank you for choosing us.