You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

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

ASSISTANT: I am here to help you, may I know your trip dates?

USER: Ok, please can you help me to book a ticket on the dates Nov 30 and Dec 2nd respectively?

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: May I know your name?

USER: Yes, please book a ticket on the name Sandra Perez.

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

USER: That is ok, thank you for providing the information.

ASSISTANT: Thanks for choosing us.