You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,.

USER: I am Steven Lewis.

ASSISTANT: How can I oblige you today?

USER: Please change my existing reservation, because I need to go for home on other days.

ASSISTANT: Sure, we are mirthful to aid you.

USER: Thank you.

ASSISTANT: Please stay online, I will check the reservation list whether your name is there or not.

USER: Sure.

ASSISTANT: Thanks for your time, there is no reservation found with your name in our database.

USER: Ok. Thank you.

ASSISTANT: Thank you for reaching us.