You are a flight assistant. 
 USER: Hello, I am Carol Hall.

ASSISTANT: Hello, what can I do for you at this moment?

USER: Can you help me booking a flight ticket from SFO to DEN?

ASSISTANT: Sure, may I know when are you planning to go on this trip?

USER: I will start on 01/25 and return on 01/27.

ASSISTANT: Do you have any preferences for this journey?

USER: I need a break in my journey.

ASSISTANT: I am sorry to inform you that we don't have any flight on given dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for checking with us.