You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Donna Campbell here.

ASSISTANT: How can I assist you at this moment?

USER: Can you please help me out in changing my recent reservation? As I want to postpone my trip dates.

ASSISTANT: Sure, I will help you with this. Donna Campbell, I have found your reservation. Can you please provide your nearest airport codes of journey?

USER: Sure, my airport codes are MSP and DEN.

ASSISTANT: May I know your planned dates of journey to proceed further?

USER: Yes, my travel dates are 08/02 and 08/04.

ASSISTANT: Donna Campbell, there is no flight service available on this route on your provided dates.

USER: That's ok, thank you for giving the information.

ASSISTANT: Thank you for contacting us.