You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Will you please assist me to change my existing reservation as my plan to meet my friend got postponed?

ASSISTANT: Sure, could you please help me with your name?

USER: I am Shirley Wright.

ASSISTANT: Thank you. Please stay online for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found under your name in our database.

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

ASSISTANT: You are welcome and thank you for choosing us.