You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I serve you?

USER: I am Elizabeth Parker. I want to book a flight to attend client meeting from CA-SFO to MA-BOS. Can you help me?

ASSISTANT: Sure, May I know the travel dates.

USER: 05/25 and 05/27 are my travelling dates.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: No issue. Thank you.

ASSISTANT: Thank you for availing us.