You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Can you please check out is there any flight available between DTW and SFO?

ASSISTANT: Sure, may I know the planned travel dates?

USER: Thank you for accepting my request, my boarding is on Dec 08 and please book my return ticket on Dec 10.

ASSISTANT: Please provide me the specifications.

USER: I would prefer economy class for my journey.

ASSISTANT: May I know the name?

USER: Sure, my name is Kimberly Gonzalez.

ASSISTANT: Sorry, there are no flights are available for your desired dates.

USER: Oh! Sad to hear that. Anyway, I will contact another booking agency. Thank you for the information.

ASSISTANT: Thank you for reaching us.