You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Laura King.

ASSISTANT: How may I guide you today, King?

USER: I need modify my reservation details, can you help me out in changing my dates of my journey?

ASSISTANT: Sure, I will help you with that. Please wait for a while, I will get back with your details.

USER: Thank you. Ok, take your own time.

ASSISTANT: I am sorry to say that there is no reservation found.

USER: That's ok, not an issue. Thank you for your response.

ASSISTANT: Thank you for reaching us.