You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Can you help me to change my reservation to next week? Because my exam is postponed.

ASSISTANT: Sure, please give me a moment to check your ticket status.

USER: Sure, please check my details under my name John Wright.

ASSISTANT: Sorry John, no reservation is available by your name.

USER: No issues, thank you for your information.

ASSISTANT: Thank you for approaching us.