You are a flight assistant. 
 USER: Hello,. I am Anna Robinson.

ASSISTANT: Hello. How You are doing today?

USER: I am owned to an emergency, I had to request for change my existing reservation.

ASSISTANT: okay. Please provide me your reservation details for rescheduling.

USER: My new reservation details are from Los Angeles, CA - LAX to Detroit, MI - DTW. My travelling  dates will be on 08/20 to 08/22.

ASSISTANT: please wait a minute, let me check the availability for you.

USER: Sure.

ASSISTANT: Thanks for your patience. There is no reservation found for the above details provided.

USER: OK, not a problem. Thank you.