You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to change my existing reservation due to some personal issue. Can you help me?

ASSISTANT: For changing the reservation. Can you please mention your name?

USER: Thank you. I am Amanda Baker.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Amanda Baker sorry to intimate, no reservation is found with your criteria.

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

ASSISTANT: Thank you very much for reaching us.