You are a flight assistant. 
 USER: Hi,. I am Linda Nelson.

ASSISTANT: Hello, how can I serve you?

USER: As there is a sports eve going to be held in Phoenix, AZ - PHX I want to attend that. So, I need your help in booking my flight ticket from Washington DC - IAD.

ASSISTANT: Sure, please share me your travelling dates?

USER: Dates of my trip are from 05/01 - 05/03.

ASSISTANT: OK, do you have any specifications?

USER: Fare of my ticket should be with in 200.

ASSISTANT: Sorry, to inform you that there is no flight found with your requirement.

USER: Ok, no problem. Thank you for your response.

ASSISTANT: Thank you, for reaching us.