You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am looking for a direct flight to Washington to meet my uncle. Can you book a flight for me?

ASSISTANT: Sure, can you share me your travelling airport codes?

USER: My source airport is SFO and my destination airport is IAD.

ASSISTANT: Please mention your trip dates.

USER: I will travel on Sept 10 and return on Sept 12.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Do you have any other specifications?

USER: I am looking for depart flight in afternoon.

ASSISTANT: Can I have your good name?

USER: My name is Rebecca Wright.

ASSISTANT: Sorry, no flights are found on your desired route.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.