You are a flight assistant. 
 USER: Hi. Christine Lewis here.

ASSISTANT: Hello, how may I lend a hand to?

USER: I would like to book a ticket from DTW to ATL, can you please help me with that?

ASSISTANT: Lewis, I am willing to help you for this. When you are willing to travel?

USER: The travel dates are from 08/12 to 08/14.

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Lewis sorry for inconvenience, no flights are available with your criteria.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you Lewis for utilizing our agency.