You are a flight assistant. 
 USER: Hello, I am Donald Williams.

ASSISTANT: Hello, how may serve you today?

USER: I want to book a direct flight as my friend met with an accident and I want to stay with him. Please help me out.

ASSISTANT: Sure, give me your travelling dates.

USER: My preferred travelling dates are from 04/27 to 04/29.

ASSISTANT: What are your source and destination airport codes?

USER: I want to fly from DEN to PHL.

ASSISTANT: We found a flight on Jetblue airline, flight number 1012.

USER: Ok, go with booking.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for opting us.