You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Helen Martinez.

ASSISTANT: How can I assist you today?

USER: I need to book a flight ticket from SFO to ORD, Can you please help me for booking?

ASSISTANT: Sure, I can help you with that. May I know your planned travel dates please?

USER: I would like to travel on 03/10 to return on 03/12.

ASSISTANT: Ok, may I know your class preference please?

USER: I am comfortable with any class.

ASSISTANT: Do you have any airline preference?

USER: I would like to depart on morning and return on morning.

ASSISTANT: Ok, please let me know if you have any other specifications.

USER: I need a connecting flight.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates with your given details.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for choosing us, have a nice day.