You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

USER: Can you please help me to book a flight from IAD to OAK?

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: I want to depart on Feb 11 and need to return on Feb 13.

ASSISTANT: On what name, do I need to reserve your ticket?

USER: Katherine Nelson here.

ASSISTANT: Let me know your connection limit?

USER: I am looking for a flight with single connection.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for reaching us.