You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: My name is Dorothy King. I would like to change my flight reservation as I have to stay for some more days at Houston, can you please help me?

ASSISTANT: Let me check your reservation status in our database to change your reservation.

USER: Sure.

ASSISTANT: Sorry, we couldn't found any reservation in our database.

USER: Not an issue. Anyway, thank you for checking.

ASSISTANT: Thank you for reaching us.