You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Pamela Adams.

ASSISTANT: How may I assist you?

USER: Can you help me for changing my existing reservation, because in my previous reservation I gave wrong airport codes?

ASSISTANT: Yes, please wait for a moment.

USER: Ok, I will wait for your reply.

ASSISTANT: I am sorry there is no reservation found on your name to change it.

USER: Oh! It's ok, no problem.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thank you for your services.

ASSISTANT: Welcome.