You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you?

USER: I am planning to change my reservation, can you help me in that?

ASSISTANT: Yes, I can help you with it. Can you please share your name to check reservation details?

USER: Ok. I am Melissa Martin.

ASSISTANT: Please wait, I will check your reservation and revert back to you shortly.

USER: Ok.

ASSISTANT: We didn't find any reservation on your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.