You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I am Margaret Roberts, I want to book a flight ticket to OAK from ORD in the month of May. Can you please help me to book a flight ticket?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: Ok, my travelling dates are 05/16 and 05/18.

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no flights found under your details.

USER: Not an issue, anyway thank you for the information.

ASSISTANT: Welcome, have a great day.