You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Linda Martinez want to book a ticket to DEN from MCO, can you please help me in booking?

ASSISTANT: Sure, can I know your preferable dates?

USER: My preferred dates are from 12/25 to 12/27.

ASSISTANT: Sorry, there are no flights found on given dates.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.