You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I render you?

USER: My meeting got postponed as of now, so I need few modifications in my existing reservation. Can you please help me in changing the reservation?

ASSISTANT: Sure, to modify your reservation I need your name?

USER: Sure. I am Justin Jackson.

ASSISTANT: Please wait, I will check your reservation status and let you know the details.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, we have checked your reservation to modify, but we could not find your reservation in our database.

USER: Ok, no issues. May be I have booked with other airlines. Thank you.

ASSISTANT: Thank you for reaching us, hope to serve you again.