You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. What type of help that you need from my side?

USER: I am Dorothy Jackson.

ASSISTANT: Nice meeting you Jackson.

USER: I want to change my reservation due to health problem, can you help me?

ASSISTANT: Sure, I am happy to help you in that ticket changing.

USER: Thank you.

ASSISTANT: Let me check with your information in our data base, please give me some time to check it.

USER: Sure, I will wait for your response.

ASSISTANT: As per your request, I am unable to find your reservation for the user name in our ticket reservation list when I have checked.

USER: No problem, thanks for checking.

ASSISTANT: You are most welcome and thank you for approaching us. Have a nice day.