You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How may I assist you?

USER: I am Samantha Lewis. I want to change my reservation due to prepone of my exams.

ASSISTANT: Reservation found by name Samantha Lewis. Please provide your travelling codes?

USER: I will depart from PA-PHL to TX-HOU.

ASSISTANT: Could you please specify travel dates?

USER: My travel dates are 06/23 and 06/25.

ASSISTANT: No flight found with your requirement.

USER: Thank you for your response.

ASSISTANT: Thanks.