You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Melissa Hill.

ASSISTANT: How may I aid you?

USER: I am going to change my reservation. Can you please help me for this?

ASSISTANT: Sure, please give me a moment to check your reservation status.

USER: Ok, I will wait for your response.

ASSISTANT: Sorry, there is no reservation found on your name in our records.

USER: Not a big problem, anyhow thank you very much for your service.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.