You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Elizabeth Perez here.

ASSISTANT: Glad to meet you Perez.

USER: I would like to book a ticket from LAS to PHL, can you please help me with that?

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates please?

USER: The travel dates are from 05/12 to 05/14.

ASSISTANT: Ok Perez, please wait a moment.

USER: Ok.

ASSISTANT: Sorry Perez, no flight is available to you on  your dates to reach PHL due to some weather conditions.

USER: That's ok, thank you for your help.

ASSISTANT: Thank you for choosing us, have a great day.