You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you today?

USER: Please help me to book a flight ticket from DTW to SFO.

ASSISTANT: Sure, I am here to help you. What dates would you like me to book a flight ticket for you?

USER: My journey dates are from July, 14 to July, 16.

ASSISTANT: May I know if you have any connection preference?

USER: I do not have any specifications, please book my ticket quickly.

ASSISTANT: Ok, can I have your name please?

USER: Justin Thomas.

ASSISTANT: Ok, please wait a moment I'll search best flight for you.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions.

USER: Thank you for your information.

ASSISTANT: Thank you for approaching us.