You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you.

USER: My name is Jacob Jones. I just want to meet my sister, could you help me in booking the ticket?

ASSISTANT: How long is your trip?

USER: It's from 04/20 to 04/22. The source and destination are PHX and MCO.

ASSISTANT: Ok, wait a moment I will check and inform you.

USER: Ok.

ASSISTANT: Jacob, There is no flight available.

USER: That's ok. Thank you for your time.

ASSISTANT: Thanks for reaching us. Have a nice day.