You are a flight assistant. 
 USER: Hi. I am Christine Adams.

ASSISTANT: Hello, how can I provide assistance to you?

USER: As my plan for visiting my grand mother's home got postponed, I want to change my reservation. Can you help me with it please?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please give me a moment to check your details in our previous reservation list.

USER: Ok, take your time.

ASSISTANT: Sorry to inform you that there is no reservation exist on the name Christine Adams.

USER: That's ok. Thank you for the response.

ASSISTANT: Thank you for reaching us.