You are a flight assistant. 
 USER: Hi. I am Christine Baker.

ASSISTANT: Hello, how may I help you?

USER: I would like to visit Rocky Mountain Arsenal National Wildlife Refuge located at Denver CO-DEN with my family friend's, so I would like to book a flight ticket. Would you please avail me in making an airline reservation from PA-PHL?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are 07/02 and 07/04.

ASSISTANT: Do you need any halt within your journey?

USER: Yes, I need a halt.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: I am sorry to inform that there is no flight found matching with your requirements.

USER: Ok, no worries at all. Thank you for your assistance.

ASSISTANT: Thanks for availing us.