You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Brenda Thomas.

ASSISTANT: How may I assist you?

USER: I am planning to celebrate my birthday celebrations at Charlotte, CLT. Can you please book me a ticket from Philadelphia, PHL?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: My planned dates of journey are from 05/23 to 05/25.

ASSISTANT: Wait a moment please.

USER: Sure, I will wait for your response.

ASSISTANT: Brenda Thomas, there are no flights available in your route.

USER: Ok, not an issue. I will find any alternate for this trip. Thank you for providing information.

ASSISTANT: Thank you for reaching us.