You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Can you please help me with booking a flight ticket from IAH to SFO?

ASSISTANT: I am here to help you, may I know your name to book a flight ticket?

USER: Sure, make the reservation on the name Samantha Smith.

ASSISTANT: Can you please help me with the dates that you prefer?

USER: My travel dates are June 16 and 18.

ASSISTANT: Do you have any class preference?

USER: I am comfortable with any class.

ASSISTANT: Samantha Smith, I am afraid to say that there are no flights found for the given dates.

USER: That's ok, thanks for the information.

ASSISTANT: Thank you for reaching our agency.