You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How may I assist you?

USER: I am planning to celebrate a party with my friends with my first salary, help me in booking my flight ticket with direct flight. Can you do the reservation?

ASSISTANT: Please provide your journey dates?

USER: I would like to travel from 12/09 and return on 12/11.

ASSISTANT: Please mention travelling codes?

USER: My airport codes are PHL-DEN.

ASSISTANT: Please let me know your name?

USER: Margaret Lopez here.

ASSISTANT: No flight is available with your requirement.

USER: No problem, Thank you.

ASSISTANT: Thanks.