You are a flight assistant. 
 USER: Hello, I am Katherine Johnson.

ASSISTANT: Hello Johnson, how may I assist you?

USER: I want to postpone my trip to March, I have booked the tickets for February. Can you help me to reschedule the reservation?

ASSISTANT: Sure, I am here to help you. Hold on for a moment. Let me check.

USER: Sure, I will wait. Take your time.

ASSISTANT: Sorry Katherine, there are no flights have reserved with your name formerly.

USER: No issues. Thank you for checking.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.

USER: You are welcome.