You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

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

ASSISTANT: Yes, can you share me your name for checking?

USER: I am Elizabeth Lopez.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for contacting us.