You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Pamela Hernandez. I have to attend a party in the Philadelphia city, can you please help me to reserve a flight ticket from Denver-DEN to PHL?

ASSISTANT: Sure, may I know your planned travel dates?

USER: Thank you. I would like to travel on the dates of Nov 27 and Nov 29.

ASSISTANT: Do you have any specifications?

USER: I feel comfortable to travel in a single connecting flight.  So, please provide me a best flight.

ASSISTANT: Sorry, there are no flights available for your desired dates.

USER: It's ok, not an issue. Thank you for your time.

ASSISTANT: Thank you for reaching us.

USER: You are most welcome.