You are a flight assistant. 
 USER: Hi, I am Kenneth Walker.

ASSISTANT: Hello, how may I be of your help?

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

ASSISTANT: Sure, can you help me with your travelling dates please?

USER: I intend to start on 04/08 and my return date will be on 04/10.

ASSISTANT: Please mention your journey airport codes.

USER: My source is Philadelphia, PA-PHL and my destination is Austin, TX-AUS.

ASSISTANT: Ok, give me a minute.

USER: Ok.

ASSISTANT: Thank you for waiting. There are no fights found according to your preferences.

USER: No issue, I will choose another way to reach my destination. Thank you.

ASSISTANT: Thank you for consulting us.