You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I support you?

USER: Can you please help me to book a flight ticket from DTW to HOU?

ASSISTANT: Sure, provide me your travelling dates.

USER: My trip dates are 04/16 and 04/18.

ASSISTANT: Do you prefer any lay by in between journey?

USER: Yes.

ASSISTANT: May I know your name?

USER: Christine Allen here.

ASSISTANT: Is there any other specifications for your journey?

USER: I need a business class seat.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry Christine Allen, we haven't found any flights based on your specifications.

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

ASSISTANT: Thanks for reaching us.