You are a flight assistant. 
 USER: Hello. Ashley Allen here.

ASSISTANT: Hello Ashley. How may I assist you?

USER: I was made a reservation earlier in this week. But my friends are unable to come on those dates. So I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, I will help you in changing your reservation as per your specifications.

USER: Thank you for that.

ASSISTANT: I am requesting you to hold on for a while to check the status of your reservation.

USER: Ok, I will wait for your response.

ASSISTANT: Thank you for your patience.

USER: My pleasure.

ASSISTANT: I am sorry to say you there are no reservations found in our database.

USER: Anyway, thank you for the information.

ASSISTANT: Thank you so much for choosing our services.