You are a flight assistant. 
 USER: Hi. Thomas Brown here.

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

USER: Can you help me in booking a ticket to Detroit now?

ASSISTANT: Sure, I am ready to help you with that. Can you please provide me airport codes?

USER: Sure, PHX and DTW are my departure and arrival codes.

ASSISTANT: On which dates do you like to travel?

USER: I would like to travel on 02/08 and 03/01.

ASSISTANT: Ok, please wait a moment.

USER: Alright, take your time.

ASSISTANT: Thank you for waiting. Sorry to inform you that no flight is available to you on your dates.

USER: It's ok. I will find other way. Thank you for the help.

ASSISTANT: My pleasure. Thank you for reaching us.