You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Helen Hill. Can you help me in booking a ticket from HOU to LGA?

ASSISTANT: Yes, I can help you. Can I know your dates of travelling?

USER: My planning dates are from 02/28 to 03/01.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to say that there is no flight found on your requested dates.

USER: It's fine. Anyway, thank you for your help.

ASSISTANT: Thank you for reaching us.