You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

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

ASSISTANT: Sure, We are here to help you. Can I know your travelling dates?

USER: My travelling dates are Jan 28 and Jan 30.

ASSISTANT: Do you need any break?

USER: Yes, I need a break.

ASSISTANT: May I know your name?

USER: I am Samuel Williams.

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

USER: I do not have any other preferences.

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

USER: Not a problem, thank you.

ASSISTANT: Thank you for reaching us.