You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Justin Martinez.

ASSISTANT: How can I aid you?

USER: I want to change my reservation. Due to my meeting has been postponed for next week. Could you please help me to change my reservation?

ASSISTANT: Sure, I will help you with that?

USER: Sure, I will wait for your response.

ASSISTANT: I could not find any active reservation under your name in our database.

USER: Thank you very much for checking my status.

ASSISTANT: Thank you for approaching us.