You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I address you?

USER: I would like to fly to Los Angels with the direct flight to treat an emergency case, can you please help me to book a flight ticket?

ASSISTANT: Sure, I can help you. Can I know your travelling dates?

USER: I need to depart on Jan 29th and my return date will be on Jan 31st.

ASSISTANT: Do you need any break?

USER: I have already mentioned above.

ASSISTANT: Please share me your airport codes.

USER: I want to start my journey from PHX and my destination airport code is LAX.

ASSISTANT: Is there any other preferences that you would like to add before booking?

USER: No, I don't have any other specifications.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: May I know your name?

USER: I am Pamela Perez.

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

USER: That's ok, I'll choose any alternative. Thank you for your information.

ASSISTANT: Thank you for opting us.