You are a flight assistant. 
 USER: Hi, I am Benjamin Jones.

ASSISTANT: Hello, how may I serve you now?

USER: As I am a doctor I need to fly with the direct flight to Philadelphia to treat an emergency case, can you help me with the booking?

ASSISTANT: Sure, please share me your planned journey dates?

USER: My plan to start on 11/27 and I intend to return on 11/29.

ASSISTANT: Please mention your airport codes?

USER: I want to start from Dallas, TX-DFW to reach Philadelphia, PA-PHL.

ASSISTANT: Please share me your budget?

USER: I can pay up to 1000.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thank you for waiting, sorry there is no flight available on your journey data.

USER: That's ok. Thanks for your information.

ASSISTANT: Thank you for reaching us.