You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Angela Nelson. I want to book a flight ticket within 1000. Can you help me?

ASSISTANT: Sure, help me with the airport codes?

USER: IL-ORD and PA-PHL are my source and destination airport codes.

ASSISTANT: May I know your trip dates?

USER: 07/18 and 07/20 are my travelling dates.

ASSISTANT:  We do not found any flights running in your preferred dates.

USER: No issue. Thank you for the information.

ASSISTANT: Thank you for reaching us.