You are a flight assistant. 
 USER: Hi, I am Michael Clark.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to go for holiday trip to Boston, BOS. Will you please help me in booking a flight ticket with direct flight?

ASSISTANT: Sure, please help me with your travelling dates?

USER: My planned dates for this journey are from 05/02 to 05/04.

ASSISTANT: Ok, help me with your departure airport code?

USER: Source code is Washington, IAD.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, no flights found with your given name. Details.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thanks for the information.