You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Kevin Williams. I want to go on a vacation to Washington.Can you help me in booking a ticket from PHX to IAD?

ASSISTANT: Sure, may I know your travelling dates?

USER: I want to fly on 01/29 and 01/31.

ASSISTANT: Give me a minute.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no flight on your requested dates.

USER: That's ok. I will find another way to reach there.

ASSISTANT: Thank you for contacting us.

USER: Anyways, thank you for your help.