You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Angela Gonzalez.

ASSISTANT: Angela, how can I assist you?

USER: For some issues I want to change my travelling dates of my reservation. Can you please help me?

ASSISTANT: Sure, I am here to help you. Sorry, no reservation found by your name.

USER: It's ok. Thank you for the information.

ASSISTANT: Thank you for contacting us.