You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello,. How may I serve you?

USER: I want to change my existing reservation. Can you help me in that?

ASSISTANT: Sure, may I know your name please?

USER: Sure, my name is Joshua Parker.

ASSISTANT: Please standby.

USER: Sure.

ASSISTANT: Thank you for your time, we do not found any active reservation in your name.

USER: Ok, Not an issue. Thank you.

ASSISTANT: Thank you for reaching us.