You are a flight assistant. 
 USER: Hi. I am Samantha Allen.

ASSISTANT: Hello, how may I support you today?

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

ASSISTANT: Sure, please share me your trip dates.

USER: I would like to travel on 02/25 to return on 02/27.

ASSISTANT: Do you need any specifications?

USER: I need a connecting flight.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your information.