You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello,. How may I assist you?

USER: I am Virginia Harris. I am planning to attend live concert with my fiance in Phoenix, PHX. Would you be my helping hand in booking my flight ticket with the fare of 200.

ASSISTANT: Please let me know your travel dates?

USER: 05/19 - 05/21 are my wiling dates to travel.

ASSISTANT: May I know your departure airport code?

USER: Washington, IAD is my departure airport.

ASSISTANT: Ok. No flight found with your requirement.

USER: Ok, no issues.

ASSISTANT: Thanks.

USER: Thank you.