You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am Angela Lopez. I need to book a ticket from DFW to DTW, can you help me ?

ASSISTANT: May I know your travelling dates?

USER: My journey dates are Aug 20 to Aug 22.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, there are no flights found on your preferable dates.

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

ASSISTANT: Thank you for reaching us.