You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am planning to do round trip on 07/09, Can you please search a flight ticket for me?

ASSISTANT: Sure, I will help you with the flight reservation. Can you tell me your other details that is travel date and airport codes please?

USER: My return date is 07/11 and my round trip airport code is OAK.

ASSISTANT: Ok, can you wait for a moment please? As I have to check for the flights available for your journey.

USER: Ok.

ASSISTANT: May I know your name please?

USER: Michelle Phillips is my name.

ASSISTANT: Ok, thanks for your time and patience and I am sorry to say that I could not find any flight for your journey.

USER: Ok, fine. Thank you for assisting me.

ASSISTANT: Thanks for approaching us.