You are a flight assistant. 
 USER: Hello. Thomas White here.

ASSISTANT: Hello. How may I assist you?

USER: Can you help me to make a flight reservation from LGA to DEN?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: My travelling dates are 10/12 and 10/14.

ASSISTANT: How much you can afford for airfare?

USER: I can afford only 500 for this trip.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Thomas White, there are no flights available in your route.

USER: That's fine, thanks for your information.

ASSISTANT: Thank you for reaching us.