You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Please book a flight ticket from SEA to IAH.

ASSISTANT: Sure. May I know your name please?

USER: Robert Davis here.

ASSISTANT: Tell me your travel dates and connection limit please?

USER: My trip dates are 09/04 and 09/06. I need a connecting flight.

ASSISTANT: Any other preferences?

USER: I prefer to return in evening.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you.