You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I be a help for you?

USER: I need to travel from Philadelphia, PA-PHL to Denver, CO-DEN. So please help me to search a flight ticket?

ASSISTANT: Sure, can I know the dates of travel?

USER: Travel dates are 09/16 and 09/18.

ASSISTANT: Can I know your name?

USER: I am Angela Perez. Make sure that connection must be 1 and price is 200.

ASSISTANT: I'm sorry Angela, there are no flights meeting your criteria.

USER: It's ok, no issues.

ASSISTANT: Thank you, have a good day.

USER: Thanks for your valuable information.