You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you?

USER: Can you please book direct flight to Washington, IAD as I want to attend for my grand parents 60th wedding anniversary?

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Where you want to travel from?

USER: I want to fly from San Francisco, SFO.

ASSISTANT: Let me know your travelling dates to check the flights.

USER: My schedule dates of journey is 05/28 to 05/30.

ASSISTANT: To proceed booking I need your good name.

USER: I am Sharon Campbell.

ASSISTANT: Please, wait.

USER: Sure.

ASSISTANT: There is no direct flight availble with your given requirements.

USER: It's ok, thank you for your information.

ASSISTANT: Thank you for picking us.