You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I am Justin Brown, can you help me to change my reservation to next week?

ASSISTANT: I am happy to help you, please hold on a moment.

USER: Sure, take your time.

ASSISTANT: Thanks for your time, I found your reservation. May I know your airport codes?

USER: My airport codes are DFW and EWR.

ASSISTANT: Ok, when you are planning to go?

USER: I am planning to fly on Nov 05 and 07.

ASSISTANT: Sorry, there is no flight for you on your route.

USER: No issues, thank you for your time.

ASSISTANT: Thanks for choosing us.