You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Thomas Brown.

ASSISTANT: How can I assist you at this moment?

USER: Please help me in booking a flight ticket to IAD from PHX.

ASSISTANT: Sure, I am here to help you. Can you please provide your journey dates?

USER: My journey dates are from Oct 25th to Oct 27th.

ASSISTANT: Do you need any lay by on this route?

USER: Yes, I need a lay by in between my journey.

ASSISTANT: Do you have any other specification for this trip?

USER: No.

ASSISTANT: Thomas Brown, we regret to inform you that there are no flight services available on this route on your provided dates.

USER: No problem, I will try with other alternative. Thank you.

ASSISTANT: Thank you for contacting us.