You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Nichole Parker here.

ASSISTANT: How can I help you today?

USER: I want to visit Los Angeles on my birthday. So, can you check for the flights from IAD to LAX?

ASSISTANT: Sure, can you share me your planning dates?

USER: My travelling dates are from Apr 29th to May 1st.

ASSISTANT: Do you have any specifications?

USER: I just need a single connection flight.

ASSISTANT: Sorry to say this, no flights are available on your desired route.

USER: Oh! That's very sad to know. Anyways, thank you for checking.

ASSISTANT: Thank you for opting us.

USER: Most welcome.