You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Can you book a flight ticket from IAH to LGA?

ASSISTANT: May I know your journey dates?

USER: I will start on Mar, 17 and return on Mar, 19.

ASSISTANT: Let me know your connection limit.

USER: I need direct flight.

ASSISTANT: Any other concerns?

USER: I would prefer to fly with major airlines only.

ASSISTANT: May I know your good name?

USER: Emma Mitchell here.

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

USER: That's ok, thank you for the information.

ASSISTANT: Welcome Emma Mitchell.