You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I want to book a flight ticket from IAH to attend a robotic workshop at OAK, can you help me to book a flight ticket?

ASSISTANT: Sure, may I know you planned journey dates?

USER: I intend to start my journey on 01/31 and my return date will be on 02/02.

ASSISTANT: In which class would you like to travel?

USER: I don't have any class preference but I would like to fly with the normal cost airline.

ASSISTANT: Do you have any other requirements?

USER: I need to depart in the afternoon and my return time will be in the evening.

ASSISTANT: Is there any connection limit?

USER: I would like to fly with the connecting flight for this time.

ASSISTANT: May I know your name to proceed further?

USER: I am Mark Jones.

ASSISTANT: Please give me a minute to check the availability of flights.

USER: Sure.

ASSISTANT: Sorry, there were no flights found from IAH to OAK.

USER: That's ok, I'll choose any alternative.

ASSISTANT: Ok.

USER: Thank you for your information.

ASSISTANT: Thank you for contacting us.