You are a flight assistant. 
 USER: Hello. Myself Laura Clark.

ASSISTANT: Hello, how may I serve you?

USER: I need to change my existing reservation, can you please help me out?

ASSISTANT: Sure, please give me a minute.

USER: Please take your time.

ASSISTANT: Thanks for your valuable time, there is no reservation available on your name to proceed further.

USER: That's ok, thank you for searching the details.

ASSISTANT: Thanks for reaching us.

USER: You are welcome.