You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Susan Clark.

ASSISTANT: How may I assist you today?

USER: Can you help me to change my reservation to next week?

ASSISTANT: Sure, we are here to help you from our agency.

USER: Good to hear that from you.

ASSISTANT: Please wait for a while, let me check your reservation status.

USER: Sure, please check.

ASSISTANT: Sorry to say you that, there is no reservation found on your name in our records.

USER: Ok, no issues.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your time.