You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Jessica Hernandez here.

ASSISTANT: How may I aid you?

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

ASSISTANT: May I know on which dates you are willing to travel?

USER: The travel dates are from Feb 05 to Feb 07.

ASSISTANT: Do you require any specifications in your journey?

USER: I prefer a stopover flight.

ASSISTANT: Sorry to inform you that unfortunately there is no flights available by the given details.

USER: Not a problem.

ASSISTANT: Thank you.

USER: Thank you.