You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Emily Roberts here.

ASSISTANT: How may I aid you?

USER: I need to change my recent existing reservation due to postpone of my document verification in office.

ASSISTANT: Nice to meet you Emily. Sure, I will help you in change of flight ticket reservation. Please wait.

USER: Sure, take your time.

ASSISTANT: Thanks for your time. But I am sorry to say that there is no flight reservation on your name to change it.

USER: That's ok, no issues. Thank you for helping.

ASSISTANT: Thank you.