You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Ruth Thomas. I want to book a ticket from PHX to IAD, to visit the National Gallery of Art which is located in Washington.

ASSISTANT: Please provide me your travel dates.

USER: Sure, my trip dates are 01/24 and 01/26.

ASSISTANT: Let me check, wait for a minute.

USER: Sure, take your time.

ASSISTANT: Sorry for this inconvenience, based on your request there is no flights for you.

USER: It's ok, thanks for your information.

ASSISTANT: It's my pleasure.