You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Dennis Martinez here. I would like to book a flight ticket from DEN to LGA. Please, assist me to book a flight ticket.

ASSISTANT: Sure, may I know your journey dates?

USER: My travelling dates are 09/30 and 10/02.

ASSISTANT: Ok, please stand by.

USER: Ok, take your time.

ASSISTANT: Thank you, sorry to say no flights found with your details.

USER: Its ok, thank you for your services.

ASSISTANT: Thank you for availing us, have a nice day.