You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Shirley Walker. I am planning to visit  San Francisco from MCO to SFO.Can you help me to book a ticket for me?

ASSISTANT: Please share your travel dates?

USER: My preferable date are 02/25 to 02/27.

ASSISTANT: As per your request there is no flight available.

USER: That's fine. Thank you for your help.

ASSISTANT: You are welcome.