You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I aid you?

USER: I am John Smith. I want a direct flight to Washington. Make sure that price limit should not exceed 200.

ASSISTANT:  Would you please send me the airport details?

USER: I want to visit Museum of flight, my source and destination codes are from OAK to IAD. My journey dates are from 01/13 to 01/15.

ASSISTANT: Ok, Wait a while.

USER: Ok.

ASSISTANT: Thank you for waiting. We did not find any flights with your requirements.

USER: Ok. Thank you for your help.

ASSISTANT: Thank you for reaching us, Have a great day.