You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you today?

USER: I want to amend an existing reservation, can you please help me?

ASSISTANT: Sure, I will aid you with that.

USER: Thank you.

ASSISTANT: Can you please mention your name for further process?

USER: Sure, I am Richard Anderson here.

ASSISTANT: Please give me a moment, I will check your previous reservation status.

USER: Sure, I will wait.

ASSISTANT: There is no previous reservation available under your name.

USER: Ok, thank you for your information.

ASSISTANT: Thank you for contacting us.