You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How can I aid you today?

USER: I would like to change my existing reservation as my examinations got postponed. Can you help me with that?

ASSISTANT: Sure, we will help you. Provide me your name for further checking.

USER: My name is Jason Baker.

ASSISTANT: There is no reservation found on your name Jason Baker in our reservation list.

USER: Ok, thank you for your response.

ASSISTANT: Thank you for reaching us.