You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Wait for some time I will check the reservations on your name and get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting there is no reservation found on your name.

USER: No issue, I will choose other alternative.

ASSISTANT: Thanks for approaching us.

USER: Thank you for the information.