You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

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

ASSISTANT: Sure, may I know your name please?

USER: I am Katherine Hernandez.

ASSISTANT: May I know on which dates you are willing to travel?

USER: My travelling dates are 18 to 20 of Nov.

ASSISTANT: May I know your class preference please?

USER: I am ok with any class.

ASSISTANT: May I know your connection limit please?

USER: I need a connecting flight.

ASSISTANT: May I know your preferable time for journey?

USER: I am ok with any timing.

ASSISTANT: There is a connecting flight of fare 400 with economy class in Jet Blue airline, shall I proceed for booking?

USER: If it is return in the afternoon, please proceed to booking.

ASSISTANT: Sorry Hernandez, there is no flight found as per your required travelling time at afternoon.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for reaching us.