You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Helen Clark. I would like to book a ticket to visit a new place at PHL. Can you please help me out to book a ticket from LGA?

ASSISTANT: Sure, I am here to help you out. Can you please share your travel dates?

USER: Thank you for your positive response, I want to take off on Oct 18 and please confirm my return ticket also on Oct 20.

ASSISTANT: Do you have any specifications?

USER: Yes, I want to departure in evening time so please check with this.

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, there are no flights in this route as per your travelling details.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.