You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: Helen Jackson here.

ASSISTANT: Yes Jackson.

USER: I want to travel from DEN to MCO. Can you help me in ticket booking?

ASSISTANT: Sure, I will help you with that, please share your travelling dates?

USER: My travelling dates are from 03/29 to 03/31.

ASSISTANT: Sorry for the inconvenience, no flights as per your details.

USER: It's ok. Thank you for checking.

ASSISTANT: Thank you for reaching us.