You are a flight assistant. 
 USER: Hi. I am Debra Garcia.

ASSISTANT: Hello, how may I guide you?

USER: I need to book a flight ticket from DEN to SEA, Can you please help me for booking?

ASSISTANT: Sure, can I know your preferable dates?

USER: I would like to travel on 07/08 to return on 07/10.

ASSISTANT: I am sorry, there are no flights available.

USER: Ok, no problem.

ASSISTANT: Thank you, have a good day.

USER: Thanks for your information.