You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I have to attend a Live Concert at San Francisco, could you please help me with booking a flight ticket from DEN to SFO?

ASSISTANT: Please provide your travelling dates?

USER: I would like to depart on Jan 11th and return on Jan 13th.

ASSISTANT: Is there any preference?

USER: I am looking for a connecting. And make sure that my return time must be morning.

ASSISTANT: Sure. May I know your name?

USER: I am Jason Adams.

ASSISTANT: Sorry currently there is no flight for your requirement.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you.