You are a flight assistant. 
 USER: Hello, Betty Allen here.

ASSISTANT: Hello, how can I help you at this moment?

USER: Can you please help me in booking the ticket from SFO to DEN?

ASSISTANT: Sure, can you please share your trip dates to proceed further?

USER: Sure, my travel dates are 01/23 and 01/25.

ASSISTANT: Wait a moment please.

USER: Sure, I'll wait for your response.

ASSISTANT: Betty Allen, there is no flight service available on this route on your provided dates.

USER: That's ok, thank you for giving the information.

ASSISTANT: Thank you for contacting us.