You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I am Margaret Garcia. I want to book a flight ticket from CO-DEN to NV-LAS, help me in booking my flight ticket.

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates will be 08/01 to 08/03.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: There is no flight found with your requirements.

USER: Its ok, thank you.

ASSISTANT: Thanks for reaching us.