You are a flight assistant. 
 USER: Hello. I am Margaret Thompson.

ASSISTANT: Hello, how may I assist you?

USER: Can you please reserve me a flight ticket from DEN to ATL?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: When did you scheduled to travel?

USER:  My travel dates are 05/14 and 05/16.

ASSISTANT: Do you prefer economy class or business class? Sorry to inform you that, no flights are available with your requirements.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thanks for your approach.