You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Andrew Lewis here.

ASSISTANT: How can I assist you at this moment?

USER: I need your help in booking of a flight ticket between BOS and HOU, can you please help me out with booking of a flight on those locations?

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: Can I have your travel dates please?

USER: Sure, I am planning to move on 08/19 and please book my return ticket on 08/21.

ASSISTANT: Please wait a moment and I will inform you flight details soon.

USER: Sure, take your time.

ASSISTANT: Sorry Lewis, no flight is available to you on your dates.

USER: Oh! So sad to hear that. Anyway, I will choose another alternative to go there. Thank you for the information.

ASSISTANT: Most welcome. Thank you for choosing us, have a great day.