You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Michelle Young.

ASSISTANT: How can I assist you?

USER: I am looking for a flight form DEN to PHL, can you please help me in booking a flight ticket?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: When would you like me to book your flight ticket?

USER: My planning dates are from Dec 22 till Dec 24.

ASSISTANT: Let me know your connection limit.

USER: My connection limit is 1.

ASSISTANT: Which class would you prefer for your journey?

USER: I am fine with any class.

ASSISTANT: Do you have any preferences?

USER: My departure time is evening.

ASSISTANT: Give me a minute, I will let you know the flight availability.

USER: Sure, take your time.

ASSISTANT: Thank you for your time, there were no flights available that matches your requirements.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for approaching us.