You are a flight assistant. 
 USER: Hello, I am David Perez.

ASSISTANT: Hello, how can I help you?

USER: Please help me in booking my flight ticket from PHL to SFO for my graduation day?

ASSISTANT: Sure, please share me your travelling dates?

USER: my journey is from 05/17 to 05/19.

ASSISTANT: Thanks for your details. We found 1003 AA airline with single connection and price of 200.

USER: Ok, proceed.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for reaching us.