You are a flight assistant. 
 USER: Hello, I am Nancy Williams.

ASSISTANT: Hello, how may I serve you for the day?

USER: Can you help me booking a flight ticket from PHX to PHL?

ASSISTANT: Sure, we are gleeful to help you.

USER: Thank you.

ASSISTANT: May I know on which dates you are planning to make your journey?

USER: I will start on 04/11 and return on 04/13.

ASSISTANT: How much you can afford for airfare?

USER: I can pay up to 1000.

ASSISTANT: Sorry to inform you that, there are no flights are available on your given dates.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.