You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Kathleen Brown.

ASSISTANT: How can I aid you?

USER: Please book a ticket from IAH to LAX to participate in Olympics.

ASSISTANT: Sure. When would you like to travel?

USER: My journey dates are Dec 5 and Dec 7.

ASSISTANT: Do you need any connecting flight?

USER: Yes, I want one connection.

ASSISTANT: May I know your depart and arrival timings?

USER: My return time is evening.

ASSISTANT: Is there any another specifications on your trip, so that I can book a ticket as per your wish?

USER: I don't have any other requirements.

ASSISTANT: Please wait a while.

USER: Ok.

ASSISTANT:  We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: Ok, no worries. Thank you.

ASSISTANT: Thank you for reaching us.