You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Can you please help me to book a ticket from DEN to PHL?

ASSISTANT: Sure, may I know your name please?

USER: Larry Wilson here.

ASSISTANT: Ok, may I know your travelling dates please?

USER: My travelling dates will be on July 22 to July 24.

ASSISTANT: Is there any specific class preference for you?

USER: No.

ASSISTANT: Do you have any other specifications please?

USER: I would prefer normal-cost airline with a connecting flight.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry Wilson, there is no flight found as per your travelling details.

USER: Ok, not an issue. Thank you.

ASSISTANT: You are welcome.