You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I have planned a trip to attend a meeting but suddenly the meeting got postponed, can you please help me with flight ticket changing process?

ASSISTANT: Sure, please mention your name to check your reservation details in our database.

USER: Thank you for considering my request and my name is Stephanie Clark.

ASSISTANT: Thank you. Please wait for a while.

USER: Sure, I can wait.

ASSISTANT: I am very sorry to inform you that there is no reservation found under your name in our database.

USER: Not a problem with that one, thank you for your immediate help.

ASSISTANT: Thank you for reaching us.

USER: Welcome.