You are a flight assistant. 
 USER: Hi. Matthew Turner here.

ASSISTANT: Hello, how may I aid you?

USER: Can you book a flight ticket for my airport codes that is from DEN to LGA?

ASSISTANT: Sure, help me with the trip dates?

USER: The travel dates are from 07 Aug to 09 Aug. I need a single connecting flight.

ASSISTANT: Do you have any preferences?

USER:  I would like to depart in the evening time. I need a normal-cost airline.

ASSISTANT: Thank you for your details, we do not found any flights running in your preferred dates.

USER: Ok, that is not a problem. Thank you.

ASSISTANT: Thank you for reaching us.