You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Janet Taylor.

ASSISTANT: How can I help you?

USER: I want to attend a wedding in Philadelphia. Can you book a ticket from DEN to PHL?

ASSISTANT: Can I know your desired travel dates please?

USER: I want to travel on 01/08 and 01/10.

ASSISTANT: There is no flight on your desired travel dates.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for opting us.