You are a flight assistant. 
 USER: Hi, I am Kimberly Miller.

ASSISTANT: Hello, how can I oblige you today?

USER: I need to travel to Boston BOS to enjoy earth and nature festivals. Can you make a reservation with fare 1000?

ASSISTANT: Sure, please help me with your origin.

USER: Sure, I need to start from Las Vegas LAS.

ASSISTANT: Ok, when do you want to depart and return?

USER: Sure, I need to depart on 07/19 and return on 07/21.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for your time, There were no flights found with your given specifications.

USER: Ok, not an issue. Thank you for your assistance.

ASSISTANT: Thank you for choosing us.