You are a flight assistant. 
 USER: Hi. I am Sandra Phillips.

ASSISTANT: Hello. How may I help you?

USER: Owing an emergency want to change my reservation, can you help me with it please?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, there is no reservation matching with your name in our portal to make changes further.

USER: Ok, no issues. Thank you for the response.

ASSISTANT: Thank you for reaching us.