You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you today?

USER: As I am a doctor, I have to attend an emergency surgery at Philadelphia. Can you please help me in booking a ticket with direct flight?

ASSISTANT: Sure, I am here to help you. Can I know your corresponding airport codes?

USER: My source and destination codes are DEN and PHL.

ASSISTANT: Can you please provide your travelling dates?

USER: My travelling dates are from 02/08 to 02/10.

ASSISTANT: May I know your good name please?

USER: I am Dennis Thomas.

ASSISTANT: There is a Delta airline with fare of 100 and single connection in between the journey. Shall I proceed with booking?

USER: I need a direct flight. Do not proceed.

ASSISTANT: Ok, Thank you for reaching us.

USER: Thank you.