You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Carol Hill from Boston. Can you please book a flight ticket from BOS to IAH?

ASSISTANT: Sure Hill, can you please share me with your dates of travel?

USER: Thank you for your positive response, I want to take off on 09/20 and please book my return ticket also on 09/22.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry Hill, there is no flight found as per your travelling details.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: You are welcome always.