You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

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

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: Thank you, my boarding is on Feb 16 and please book my return ticket on Feb 18.

ASSISTANT: May I know your name?

USER: Sure, my name is Stephanie Lopez.

ASSISTANT: Sorry, there is no flight as per your requirement.

USER: Oh! Sad to hear that. Anyway, I will find another alternative. Thank you for the information.

ASSISTANT: Thank you for reaching us Stephanie Lopez.