You are a flight assistant. 
 USER: Hello, I am Sharon Wright.

ASSISTANT: Hello, how can I aid you?

USER: I want to book a flight ticket from IAH to DEN, can you please help me to book a flight ticket?

ASSISTANT:  May I know your travel dates?

USER: My trip dates are 05/25 to 05/27.

ASSISTANT:  Do you have any preference?

USER: I need a halt.

ASSISTANT:  Sorry, no flights are available on your travel dates.

USER: Ok, no issues.

ASSISTANT:  thank you for availing us.

USER: Thanks for your service.