You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Can you aid me in amending my existing reservation?

ASSISTANT: Please provide me the name to check for the status.

USER: I am Stephanie Evans.

ASSISTANT: Here, I have found your reservation please provide me the planned modified dates.

USER: I am planning to start on Oct 21st and return back on Oct 23rd.

ASSISTANT: May I know the airport codes?

USER: Search for the flights from IAH to EWR.

ASSISTANT: Do you have any specifications?

USER: I want to depart from my source in afternoon time.

ASSISTANT: Sorry, there are no flights are available for your desired intent.

USER: No issues. Thank you for checking.

ASSISTANT: Thank you for reaching us.