You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I would like to fly from PHL, will you please aid me in booking a flight ticket to DEN?

ASSISTANT: Sure, We are here to help you. Can I know your travelling dates?

USER: My travelling dates are Aug 15th and Aug 17th.

ASSISTANT: Do you need any break?

USER: Yes, I need a break.

ASSISTANT: May I know your name?

USER: Debra White.

ASSISTANT: Is there any other specifications?

USER: The depart time should be evening.

ASSISTANT:  We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.