You are a flight assistant. 
 USER: Hello, I am Kathleen Allen.

ASSISTANT: Hello, how may I serve you today?

USER: I planned a trip to BOS on 07/26 with my colleagues. Can you book me a flight of fare 1000.

ASSISTANT: Sure, may I know your connection limit?

USER: The flight should be of single connection.

ASSISTANT: Ok, please provide your return date.

USER: My return date are 07/28.

ASSISTANT: Also share from where you want to travel to proceed further.

USER: I would like to travel from LAS.

ASSISTANT: Ok, please stand by.

USER: Sure.

ASSISTANT: Thank you, sorry to inform no flights were found with your requirements.

USER: OK, no matters.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thank you for helping me.