You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I want to book a ticket from SFO to HOU. Could you book a ticket?

ASSISTANT: Sure, may I know your trip dates?

USER: Trip dates are June, 12 and June, 14.

ASSISTANT: May I know your name?

USER: My name is Donna Scott.

ASSISTANT: Sorry, we could not find any flights available on your preferred dates.

USER: Thanks.

ASSISTANT: Thank you for reaching us.