You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I would like to meet my brother as he is unwell, could you please help me to book my flight ticket from LGA to PHX?

ASSISTANT: Sure, can you please share your travel dates?

USER: I want to depart on 07/18 and return on 07/20.

ASSISTANT: May I know your name to proceed further?

USER: My name is Samuel Roberts.

ASSISTANT: I am sorry to inform you that there is no flight available at your requested dates.

USER: Not an issue, thank you for checking.

ASSISTANT: Thank you for reaching us.