You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I address you?

USER: I have planned to book a flight to reach Denver to meet my friend on 01/21, so that I need to book a flight with a halt. Can you please help me in booking a flight from OAK?

ASSISTANT: Sure,I can help you. Can I know your destination airport code?

USER: My destination airport code is DEN.

ASSISTANT: When would you like to return?

USER: I intend to return on 01/23.

ASSISTANT: May I know your name?

USER: Sure, my name is Jennifer Wright.

ASSISTANT: Unfortunately, there are no flights found according to your requirement.

USER: No worries, thanks for your response.

ASSISTANT: Thank you for reaching us.