You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Sandra Hall here.

ASSISTANT: Welcome to our Airline agency. How can I assist you today?

USER: Thank you, Due to sudden heath issue, I am unable to travel in a flight. So could you please help me out cancelling of my reservation?

ASSISTANT: Sure, I will definitely help you with that.

USER: Thank you.

ASSISTANT: Will you please give me a moment for checking your reservation?

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for waiting.

USER: No problem.

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

USER: Oh, not a problem. I think my family members are cancelled my reservation. Anyway, thank you for the information.

ASSISTANT: It's my pleasure, have a great day.

USER: Welcome.