You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Eric Carter.

ASSISTANT: How may I serve you today?

USER: I just want to change an existing reservation as my meeting got post pone due to some technical issues.Can you help me?

ASSISTANT: Please give me a moment.

USER: Ok.

ASSISTANT: There is no reservation found with your given name in our data.

USER: No issue. Thank you.

ASSISTANT: Thank you for choosing us.