You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: Nicholas Carter here. My convocation is going to held in Phoenix, can you help me in booking a ticket from IAH to PHX?

ASSISTANT: I am here to help you, can you please tell me your trip dates?

USER: Sure, my trip dates are from 07/10 to 07/12.

ASSISTANT: Ok, please wait for a while.

USER: Ok, carry on.

ASSISTANT: Sorry Carter, there are no flights available on your preferred dates.

USER: Ok, not an issue. Thank you for checking.

ASSISTANT: You are welcome, thank you for contacting us and have a nice day.