You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

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

ASSISTANT: Sure, can you please share your travelling dates?

USER: My travelling dates are June 16 to June 18.

ASSISTANT: Ok, do you need any break in between the journey?

USER: I need a direct flight.

ASSISTANT: May I know your name please?

USER: Mark Garcia here.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Ok, wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting there are no flights found on your details.

USER: No problem, thank you.

ASSISTANT: Thanks for approaching us.