You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

USER: Yes, I would like you to make my flight reservation from PHL to DEN. Can you please help me?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: Thank you. I will depart on Apr 23rd and return back on Apr 25th.

ASSISTANT: Ok, could I have your name please?

USER: My name is Helen Nelson.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I only need a connecting flight.

ASSISTANT: Ok do you have any other specifications?

USER: No.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: Not an issue. Anyway, thank you for checking.

ASSISTANT: You are welcome, have a great day.