You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

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

ASSISTANT: Please wait a moment I will revert you back with the proper information.

USER: Sure, take your time.

ASSISTANT: Thanks for your time, there is no reservation found on your name to change it.

USER: No issues, thank you for your service.

ASSISTANT: Thanks for contacting us.