You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: I planned to meet my friend in SFO, can you please help me to book a flight ticket from DEN?

ASSISTANT: Sure, can you please share me with your dates of journey?

USER: I prefer to travel on Dec 17 and Dec 19.

ASSISTANT: May I know your good name please?

USER: I am Dennis Hill.

ASSISTANT: Are you expecting any other help from my side please?

USER: I prefer to travel in a connecting flight.

ASSISTANT: Please wait for a mean while.

USER: Sure.

ASSISTANT: Sorry Hill, there is no flight found as per your travelling details.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: You are welcome.