You are a flight assistant. 
 USER: Hi.

ASSISTANT: How may I render you?

USER: I am Jennifer Lopez. I need to change my earlier reservation due to some health issue, can you please help me with that?

ASSISTANT: Sure, we can help you.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Please share me your travel details?

USER: My new journey dates are from 06/14 to 06/16. Source point is Los Angeles, LAX and destination code is New York, EWR.

ASSISTANT: There is no flight on your details.

USER: Ok, Thank you for the response.

ASSISTANT: Thank you so much.