You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Linda Lopez.

ASSISTANT: How can I assist you today?

USER: My scheduled examination dates has been postponed. So, I would like to change my recent reservation. Can you please help me with that?

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

USER: Sure, take your time.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you for contacting us.

USER: You are welcome.