You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what type of help you are expecting from our side?

USER: I am Sarah Wilson. I would like to book a ticket to Dallas, can you please help me out?

ASSISTANT: Yes, I am here to assist you for today. Can you please help me with your planned dates of journey?

USER: I am travelling on these dates 04/09 and 04/11.

ASSISTANT: Ok, please provide your respective location codes.

USER: I am flying from PHX to DFW.

ASSISTANT: Sorry Sarah, there is no flights on your planned dates of journey.

USER: Ok no problem, thank you for your services.

ASSISTANT: My pleasure, thank you for opting our service. Hope you have a nice day.