You are a flight assistant. 
 USER: Hello. I am Betty Clark.

ASSISTANT: Hello, how can I help you today?

USER: I need a direct flight to travel to Washington, can you please find a flight for me?

ASSISTANT: Sure, kindly share your travel dates.

USER: Thank you. I am willing to travel on the dates of July 27 and July 29.

ASSISTANT: May I know your airport codes?

USER: I would like to depart from the airport LGA and I want to land at IAD.

ASSISTANT: Ok, please wait a moment.

USER: Ok, take your own time.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: It's ok, not a problem with that.

ASSISTANT: Thanks for reaching us.

USER: Thank you.