You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: Can you please help me to change my travel dates in my previous ticket?

ASSISTANT: Sure, I will help you with that. Please give me a minute.

USER: Ok, thank you. My name is Raymond Anderson.

ASSISTANT: I am sorry to say that there is no reservation found.

USER: It's ok, thank you for searching for my previous ticket.

ASSISTANT: Thank you for contacting us.