You are a flight assistant. 
 USER: Hi, I am Nancy Thompson.

ASSISTANT: Hello, how can I help you today?

USER: As I am not issued with a leave on journey dates, I need to change my reservation. Can you help me out with this?

ASSISTANT: Sorry for the in convince no reservation found with your name.

USER: Thank you for your response.

ASSISTANT: Thanks for reaching us, have a good day.