You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to travel from PHL to DEN. Can you help me to book a flight ticket?

ASSISTANT: Sure, please provide your travelling dates.

USER: I want to fly in the flight on Feb 26 and Feb 28.

ASSISTANT: Ok, Do you have any class preference?

USER: No.

ASSISTANT: Ok, please let me know your specific depart and return timings.

USER: No, but I am looking for a direct flight.

ASSISTANT: Ok, please wait for a while.

USER: Ok, take your time.

ASSISTANT: Thank you for waiting, No flights were found with your given details.

USER: That's ok. Anyways, thank you.

ASSISTANT: May I know your name?

USER: I am Brandon Collins.

ASSISTANT: Ok, Thank you for choosing us.