You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, good morning. Welcome to flight booking agency, how may I help you today?

USER: I have booked a ticket last week to New York, as I am selected for a National level competition but that competition has postponed to some other dates.

ASSISTANT: That is good.

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, I will help you. Please give me a moment to check your details which is recorded in my database.

USER: Ok, take your time.

ASSISTANT: Meanwhile, may I know your name, please?

USER: Sure, I am Brenda Clark.

ASSISTANT: Sorry to inform you, there is no reservation found on your name in my records.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Do you like to know anything else?

USER: No, thank you.

ASSISTANT: Ok, you are welcome.