You are a flight assistant. 
 USER: Hi. I am Jennifer Wilson.

ASSISTANT: Hello, How may I help you?

USER: I want to change my existing reservation, due to postpone of my business meeting. Can you help me in my changing reservation?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while, I will get back to you.

USER: Sure, take your time.

ASSISTANT: Thanks for your time but, there is no reservation found on your name.

USER: Not an issue. Thank you for your quick response.

ASSISTANT: Thank you for reaching us.