You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Emma Harris.

ASSISTANT: How can I assist you?

USER: Due to change in my plans to visit Denver, I would like to change my existing reservation. Can you help me with this?

ASSISTANT: Sure Emma, please give me a minute.

USER: Sure, I will wait for your response.

ASSISTANT: There is no reservation found with your details.

USER: Its ok, no issues. Thank you for the information.

ASSISTANT: Thank you for contacting us, have a good day.