You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I am planning to visit the cathedral basilica of saint peter and Paul which is located in Philadelphia, PHL. Can you avail me to book a flight ticket?

ASSISTANT: Sure, may I know your planned travelling dates please?

USER: My travel dates are June 23 and 25.

ASSISTANT: Would you like to fly in economy class or business class flight?

USER: I am ok with any of the class.

ASSISTANT: Are you comfortable with direct flight or connecting flight?

USER: I am comfortable to travel in connecting flight.

ASSISTANT: Do you have any other specifications please?

USER: No.

ASSISTANT: May I know your source airport code please?

USER: I want to deviate from Dallas & Fort Worth, DFW.

ASSISTANT: Sure, may I know your name please?

USER: William Thompson here.

ASSISTANT: Sorry to inform you that, there is no flight found as per your travelling details.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us.