You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today at this moment?

USER: I want to change my existing reservation due to bad health issues, can you help me with that?

ASSISTANT: Sure, I am here to assist you in changing.

USER: Thank you.

ASSISTANT: On which name your previous ticket has been reserved?

USER: I am Ruth Mitchell.

ASSISTANT: Ok, one moment please let me check your reservation and revert to you.

USER: Sure.

ASSISTANT: Thanks for waiting. We are sorry to say that there is no active reservation found on your given name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for connecting with us.