You are a flight assistant. 
 USER: Hello, I am Samuel Mitchell.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me in booking my flight ticket from HOU to OAK.

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

USER: My planned trip dates are July 21-23.

ASSISTANT: Do you have any particular time for departing and returning?

USER: I need to depart in the evening and return in the morning.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you for reaching us.