You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Frank Wright here. I would like to reserve a ticket for my journey from BOS to LAS, can you help me out?

ASSISTANT: Sure, can I have your travel dates please?

USER: My travelling dates will be from 04/22 to 04/24.

ASSISTANT: Ok, please wait a moment.

USER: Sure, I am waiting.

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

USER: Ok, please book it for me.

ASSISTANT: Thank you for choosing us.

USER: Ok, that's fine. Thank you for checking.

ASSISTANT: Thank you for choosing us, have a good day.

USER: Most welcome.