You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Richard Evans. I am having an interview at Philadelphia, can you book a ticket for me?

ASSISTANT: Sure. I am here to help you. Can you please provide your airport codes?

USER: My source and destination airport codes are LGA and PHL.

ASSISTANT: Ok, mention your travelling dates.

USER: I am planning my journey on 12/02 and 12/04.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you.

USER: Take your time but fare should be within 200.

ASSISTANT: Sorry Evans, there are no flights available on your requested dates.

USER: No issues. Thank you for checking.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.

USER: You are welcome.