You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Patrick Phillips. I need to book a ticket from PHL to SFO to meet my friend for attending the interview. Could you please help me?

ASSISTANT: Sure, do you have any price limit?

USER: Price should be below 500.

ASSISTANT: Help me with the trip dates?

USER: My travelling dates are 10/03 and return on 10/05.

ASSISTANT: Thank you for the details, we do not found any flights running to your locations.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for reaching us.